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Attitude Towards Drug Therapy in a Community Mental Health Center Evaluated by the Drug Attitude Inventory

Authors Di Lorenzo R, Perrone D, Montorsi A, Balducci J, Rovesti S, Ferri P

Received 1 March 2020

Accepted for publication 28 April 2020

Published 17 June 2020 Volume 2020:14 Pages 995—1010

DOI https://doi.org/10.2147/PPA.S251993

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 2

Editor who approved publication: Dr Johnny Chen


Rosaria Di Lorenzo,1 Daniela Perrone,2 Anushree Montorsi,3 Jessica Balducci,4 Sergio Rovesti,5 Paola Ferri6

1Mental Health and Drug Abuse Department of AUSL-Modena, Psychiatric Intensive Treatment Facility, Modena 41122, Italy; 2Mental Health Department, UOC Psychiatry, Fermo 63900, Italy; 3School of Nursing, University of Modena and Reggio Emilia, Modena 41124, Italy; 4School of Specialization in Psychiatry, University of Modena and Reggio Emilia, Modena 41124, Italy; 5General and Applied Hygiene, Department of Biomedical, Metabolic and Neural Sciences, Public Health Section, Modena, 41125, Italy; 6Nursing, Department of Biomedical, Metabolic and Neural Sciences, Public Health Section, Modena, 41125, Italy

Correspondence: Rosaria Di Lorenzo Email saradilorenzo1@alice.it

Introduction: Negative attitude towards drug therapy can foster limited adherence to treatment, which remains one of the biggest obstacles for implementing effective treatments, especially long term.
Purposes: The purposes of the study were 1) to evaluate the attitude towards drug therapy among a representative sample of patients treated in a community psychiatric service using 30-item Drug Attitude Inventory (DAI-30); 2) to evaluate the DAI-30 dimensions, applying factorial analysis; and 3) to highlight the socio-demographic and clinical variables correlated to DAI-30 score and factors.
Methods: The DAI was administered, over a 7-month period, to all patients treated in our psychiatric outpatient services who agreed to participate in this study and provided their informed consent. Data were statistically analyzed.
Results: With a response rate of 63.3%, 164 females and 136 males completed the DAI-30 with an average score of 14.24 (± 10.46 SD), indicating moderately positive attitude towards drug therapy. The analysis of DAI-30 internal consistency confirmed its reliability (Cronbach’s alpha=0.84). Our factorial analysis highlighted three factors: Factor 1 (Cronbach’s alpha=0.81), composed of 7 items which indicate positive, trustful attitude; Factor 2 (Cronbach’s alpha=0.78), composed of 5 items indicating negative attitude of suspiciousness; and Factor 3 (Cronbach’s alpha=0.66), composed of 4 items suggesting defensive and control attitude towards drug therapy.
Discussion: Among the selected variables, “monotherapy” and “total number of hospitalizations” were negatively correlated to the final score of DAI-30, whereas being “married” was positively correlated to it, in a statistically significant way, using the multiple linear regression model. These correlations suggest that positive attitude towards drug therapy could be reinforced by the condition of being married and reduced by relapses with hospitalization, as literature highlighted, and, paradoxically, by a monotherapy, which could suggest a sort of psychological dependence on therapy and, indirectly, on psychiatric service, potentially correlated to the long-term treatments of our patients.

Keywords: attitude towards drugs, psychiatric disorders, community mental health center, therapy adherence

Introduction

The lack of adherence to a therapeutic regimen is a complex and multifactorial phenomenon and has constituted a well-known challenge since the dawn of medicine.1 The World Health Organization identified some factors of treatment non-adherent behaviour: socio-economic and clinical characteristics of patients, type of therapy and treatment, quality of the relationship between professional and patient, other psychosocial characteristics of environment.1 Between one-third and one-half of drugs prescribed for chronic or long-term conditions are not taken by patients according to the indications of the prescribers.2 Adherence is greater in patients who have an acute illness than in those who suffer from a chronic illness.3 Poor therapeutic adherence is a complex problem, often persistent and resistant to “generic” approaches,46 which requires complex interventions to improve the overall quality of care.57 Poor adherence to treatment represents the main cause of suboptimal clinical outcome in all diseases,8,9 resulting in inefficient utilization of economic resources.

In psychiatric practice, the lack of adherence to treatment appears to be correlated both to the patient’s attitude towards therapy, such as distrust, ambivalence, rejection for unpleasant undesirable effects, and to the state of illness that, if acute and severe, can favour the refusal of drug intake. The patient who does not adhere to treatment can induce in the therapist feelings of impotence and frustration, which can favour excessive pharmacological prescription, interpreted as an expression of the so-called “counter-transference desperation”.10 In psychiatry, the patient often presents, at the same time, “continuous” symptoms and “discontinuous” relationship with treatment.11 A historical review of adherence in psychiatric disorders compared with organic ones,12 showed lower adherence rates in patients taking antipsychotic drugs (58%), compared to those who took treatments for physical disorders (76%), although this result could have been biased due to different methodologies for measuring the therapeutic adherence.12 Recently, a systematic review of 39 studies reported an average rate of non-adherence in schizophrenia patients of 41%, which would increase to 50% when the analysis is restricted to more methodologically rigorous studies.13 It has been observed that about 75% of patients with schizophrenia stopped taking the drugs within 2 years following the first hospital discharge.14 In 2002, Rossi et al15 identified three critical factors for therapeutic adherence related to person (attitudes, judgments, personality traits, personal beliefs), treatment (side effects and tolerability, complexity of treatment, doctor–patient relationship, efficacy of treatment, attitudes of rejection of therapy) and pathology (lack of insight, grandiosity, depressive symptoms, cognitive deficits). The conceptualisation of medication adherence is complex and, in accordance with some authors, illness and treatment-related subjective attitudes may be more relevant for collaboration in outpatient antipsychotic drug treatment than side effects, cognitive functioning or any socio-demographic variable.16 Although continued use of anti-psychotic treatment after symptom remission is sustained by most guidelines, poor therapeutic adherence remains the major obstacle for the treatment of patients with schizophrenia and other psychoses.17 A recent systematic review has estimated at 3% the one-year recurrence rate for patients who continued antipsychotics whereas the risk of recurrence is increased to over 90% among patients who had discontinued antipsychotic therapy within 2 years.18 There is a general consensus on the fact that lack of adherence represents the major criticality in treatments, especially long-term ones, in the most severely ill patients19 with further negative repercussions on both the patient’s quality of life and Mental Health Services.20 One of the most immediate consequences of lack of adherence is a high rate of relapse, which can favour the so-called “revolving door” phenomenon.21 Patients with relapses have a greater risk of self-injurious behaviour, increased suicide and death rates, greater difficulty in re-entering the workforce and risk of remaining dependent on their families,22 with worsening of quality of life and family and social relationships.23,24 In turn, as the CUTLASS study showed, the best adherence derives from a better quality of life.25 Although most studies are based on populations affected by schizophrenic spectrum disorders, similar difficulties in maintaining drug treatment for a long period are present in patients affected by bipolar disorders26,27 and other mood disorders.28 A more recent systematic review, after having analysed 36 prospective and observational articles, divided the non-adherence factors in severe psychiatric illnesses into “intentional and unintentional”.29 Among intentional non-adherence, the significant variables were the degree of illness insight, the attitude towards drugs and the therapeutic alliance. More detailed analyses that explored the relationship between these variables suggested that the positive effect of insight or disease awareness and therapeutic alliance on adherence is indirect and likely mediated by positive attitude and judgement towards drug therapy.3032 Another study highlighted a complex relationship between side effects and adherence characterized by correlations of opposite polarity that “compete” with each other; on the one hand, the deterrent impact of unpleasant adverse effects and on the other the patient’s willingness to tolerate them in exchange for beneficial effects.33 Regarding the unintentional factors of non-adherence, the use or abuse of substances represents the variable most consistently identified by literature reviews, regardless of the type and stage of psychiatric pathology.24,34-37 Lack of family and/or social support are other factors that could contribute to unintentional non-adherence; on the other hand, the positive attitude of family members towards therapy and their active involvement in the treatment of schizophrenia patients are significantly associated with positive adherence.30,38 Good social support, such as the presence of valid family assistance, helps the patient in taking therapy, reducing the negative effect of substance abuse or other factors.39 A pilot study by Sapra et al40 highlighted that the group of patients with psychosis at onset having a good therapeutic relationship with caregivers are more adherent to therapy than the group of patients with multi-episodic schizophrenia. A more recent study has highlighted that treatment adherence among patients suffered from psychiatric disorders cannot be significantly influenced by socio-demographic or clinical factors only, but rather by attitudes toward medications, perceptions of personal necessity for medication and concerns about its potential adverse effects.28 A recent study has confirmed that patients’ attitudes towards their medication influence drug adherence in severe psychiatric patients.41 As recently reported by some authors, the therapeutic adherence can be significantly associated with illness insight and “perceived treatment-related trauma” related to previous treatment experiences.42 A recent review on this topic has reported that only long-term or pragmatic interventions focused on medication adherence showed successful outcomes.43

Drug Attitude Inventory

The Drug Attitude Inventory (DAI) is a self-completed questionnaire composed of 30 items (True/False), DAI-30, on the effects of treatment with psychotropic drugs, helping to identify the target of the pharmacotherapy management.44 In 2001, a validation study of the Italian version of the DAI-30 highlighted that the Italian version maintained the psychometric properties of the original questionnaire.45 The initial exploratory factor analysis, although carried out in a relatively small sample, highlighted the same factors evidenced by the DAI authors.45

The questionnaire was subsequently validated in Korean46 and in Turkish;47 its reduced 10-item version was used in an Egyptian study.48 In Tunisia, it was validated by the study of Nakhli et al,49 which examined a sample of 204 outpatients with schizophrenia, reporting 7 factors responsible for 59.9% of the overall variance, with a Cronbach’s alpha of 0.88. The DAI-30 was used in numerous studies as a questionnaire for predicting adherence in schizophrenia and major depression patients. Townsend et al50 used DAI-30 in a sample of 122 adolescent patients diagnosed with heterogeneous psychiatric disorders, where the questionnaire was shown to be a valid tool even changing the dichotomous answers True or False to ones ranged between 1 and 5 in a Likert scale. Balestrieri et al51 analyzed the attitude towards therapy using the DAI-30 in a homogeneous for pathology sample of 145 patients treated in monotherapy with five different antipsychotics. Similarly, a cross-sectional analysis52 using the reduced version DAI-10 in 291 patients with schizophrenia highlighted that only some variables, such as family support, insight of illness, therapeutic alliance and number of psychiatric hospitalizations, significantly influenced drug attitude. Recently, the reduced version DAI-10 administered to 60 patients with schizophrenia showed that the group with the greatest therapeutic adherence was that in which individualized interventions had been implemented to encourage a positive drug attitude.53

Purposes of the Study

The main objective of the present study is to evaluate the attitude towards drug therapy of patients treated in an outpatient psychiatric service using the DAI-30.

The secondary objectives are to evaluate the DAI-30 dimensions, applying factorial analysis, and to highlight the demographic and clinical variables correlated to DAI-30.

Materials and Methods

The Sample

The sample is represented by the patients treated in a Community Mental Health Center (CMHC) located in a Northern Italian city, during the period of data collection (from 8/9/2018 to 8/4/2019), according to our inclusion and exclusion criteria.

Inclusion criteria:

  • All patients pharmacologically treated in our CMHC during the study period who agreed to participate in the study.
  • All the above who provided, or whose legal guardian provided, written informed consent to the study.

Exclusion criteria:

  • Patients not pharmacologically treated in the CMHC.
  • Patients on first consultation in the CMHC.
  • Patients unable to provide valid consent.

In order to collect a sample numerically representative of our population, we calculated a sample size of 330 individuals from the population of 2,320 patients treated in 2018 at our CMHC, with a margin of error of 5%, assuming a level of bilateral significance (α) of 0.05 and confidence interval of 95%.

Design of the Study

This is a cross-sectional observational pilot study, carried out by administering the DAI-30, already translated and validated in Italian.45 The test was administered to patients during CMHC opening hours from Monday to Saturday. Patients were enrolled by two researchers authorized by the Ethics Committee, who did not treated the study patients. If participants were unable to independently complete the DAI-30, the questionnaire was administered by the researcher. Subsequently, the same researcher completed the form with the socio-demographic and clinical variables of participants.

DAI-30

The criterion for scoring the questionnaire described by its authors44 includes a total of 30 questions, 15 positive (the expected responses will be T), which assess adherence, and 15 negative (whose expected answers will be F), which evaluate non-adherence. The sum of the obtained score is expressed in a whole number ranged between −30 and +30.44

The original version of DAI includes 30 items (DAI-30), which are distributed over 7 factors, according to the validation study of the authors who built the scale.44 Factor 1 contains items that express feelings of well-being that the patient attributes to the effects of drugs. Factor 2 represents the negative effects that the patient attributes to drugs; the sum of the items of these two factors identifies a construct called “subjective response to treatment”. The remaining five factors constitute “attitudes and opinions” that are considered important in determining therapeutic adherence: Factor 3 can be interpreted as the patient’s idea of health or illness (for example, the pills are taken when one is sick and not when one is well); Factors 4 and 5 include items that express the patient’s attitude regarding the control of therapy intake; Factor 6 consists of two items formulated to indicate what the patient believes on drug efficacy to prevent relapses; Factor 7 concerns potential toxic effects. The sum of the items of these last five factors identifies a construct called the “attitude towards therapy”. As reported in the work of the authors of the questionnaire, Hogan et al,44 the DAI-30 can therefore be divided into two sub-scales, one of the 14 items and the other of 11. The remaining 5 items are omitted from the evaluation. The first sub-scale, which includes Factors 1 and 2, evaluates the “subjective response to treatment”; the second, which includes the remaining five factors, assesses the “attitude towards therapy”.

Selected Variables

  1. Socio-demographic variables: age, sex, nationality, marital status, schooling, work, living environment.
  2. Clinical variables: psychiatric diagnosis according to ICD-9-CM (International classification of diseases, 9th revision, Clinical modification),54 number of psychiatric hospitalizations, time since the last admission, period of care at CMHC, prescribed drugs, modality of drug administration, mono/polytherapy, organic comorbidity, treatment in other community services.

For each patient, the aforementioned variables were retrospectively collected from patient medical records and from informatics database at CMHC and, after the anonymization of personal data, inserted in an Excel database.

Statistical Analysis

We applied descriptive statistical analysis of the variables: mean and standard deviation (SD) for continuous variables; percentages for categorical variables. After having applied skewness and kurtosis test for normality, we analysed continuous variables normally distributed using t-test and applied non-parametric method (Kruskal Wallis test) for analysing continuous variables not normally distributed. We analysed categorical variables using Pearson’s chi-square test.

Cronbach’s alpha coefficient was applied to highlight the internal consistency of DAI-30 in Italian version.

An exploratory factor analysis (EFA) was applied to DAI-30 score, to preliminarily investigate the factors underlying the scale. The conventional approach of principal factor analysis was used, followed by orthogonal (varimax) and oblique (promax) rotation.55,56 To verify the appropriateness of the analysis performed with the orthogonal rotation, the oblique rotation of the factors was carried out, which made it possible to assess the interdependence of the factors themselves. The factors highlighted by the orthogonal rotation were selected on the basis of a dual criterion: eigenvalue >1 for each factor (Kaiser’s criterion),57 subsequently confirmed by the scree-plot. The items with factor loadings >0.40 on a given factor were therefore identified as “good indicators of a factor”. The greater the factor loading, the more relevant the variable related to the factor. The Kaiser-Meyer-Olkin (KMO) test58 was used to verify the suitability of the sample for application of the factor analysis and Bartlett’s spherical test to verify the applicability of the factor analysis in our sample.

For each factor the internal consistency was calculated by means of Cronbach’s alpha coefficient.

The DAI-30 score and the score of the items underlying the factors were correlated with the selected variables through a multiple linear regression test, stepwise model. We applied the backward stepwise selection, considering variables for removal from the model if their p-value was ≥0.2 and would reconsider previously deleted variables for re-entry if their p-value was <0.1.

A p < 0.05 and two-sided alpha level of 0.05 were used as the probability statistic level of significance. The statistical analysis was conducted through the STATA 12 software program version (2011).

Ethical Considerations

The present research was conducted in accordance with the principles of the Helsinki Declaration (World Medical Association, 1964) and good clinical practice. The study was approved by the Ethics Committee of the “Area Vasta Emilia Nord” (Prot. no. AOU 0023224/18 of 19-9-2018) and was authorized by the local Department of Mental Health and Drug Abuse (Decision no. 1843 of 5–10-2018). Informed written consent was obtained from each patient or their legal guardian before his/her participation in this study.

Results

Our Sample

During the data collection period, 300 participants, 164 females and 136 males, among the 474 patients who were asked to participate in the study, agreed to correctly complete the DAI-30, after having provided their informed consent, with an overall response rate of 63.3%. In Figure 1, the flow diagram of participants screened is shown. The sample size is numerically close to the appropriate size to represent the population of 2,320 patients treated in our CMHC in 2018.

Figure 1 The flow diagram of participants screened.

The Selected Variables

Regarding the socio-demographic variables (Table 1), our participants were 48.54 years old (minimum 18, maximum 85), without a statistically significant difference between the two genders (p=0.65, Skewness/Kurtosis tests; t=1.88, p=0.061, t-test). The majority of them was Italian (87%), 38% were employed, most of them had attended a middle (37%) or high school (37%), without a statistically significant difference between the two genders; regarding marital status, women were more frequently married than men (Pearson chi2=17.66, p<0.001) and lived in the marital family in higher percentage than men (Pearson chi2=16.59, p=0.002).

Table 1 Socio-Demographic Variables of Our Sample

We did not highlight any statistically significant difference between the two genders regarding the clinical variables shown in Table 2. The patients of our sample had quite a long history of psychiatric illness, being in care at our CMHC for more than 10 years in 40% of cases. Most of our patients (73%) were treated only in our community services. Among the psychiatric diagnoses, schizophrenic disorders and other psychoses were prevalent (34%), followed by bipolar disorders (22%), personality disorders (17%), neurotic disorders (14%), adjustment reactions (7%) and alcohol and/or drug-induced mental disorders (1%). An organic comorbidity was present in 45% of our sample. Without any statistically significant difference between the two genders, the majority of our sample (83%) had not been hospitalized in a psychiatric ward in the previous year (p<0.001, Skewness/Kurtosis tests; males vs females, p=0.699, Kruskal–Wallis test) and each patient had an average 1.74 psychiatric hospitalizations from the illness onset (p<0.001, Skewness/Kurtosis tests; males vs females, p=0.299, Kruskal–Wallis test).

Table 2 Clinical Variables of Our Sample

All patients in our sample were taking drug therapy at the time of DAI-30 administration, according to the inclusion criteria. Most patients took an oral therapy (88%), consisting mainly of antipsychotics (66%), which, in the different formulations (oral, depot) are the most represented drugs in our sample, followed by benzodiazepines and antidepressants (60%) (Table 3). Both antidepressants (Pearson chi2=21.61, p=0.004) and benzodiazepines (Pearson chi2=8.24, p<0.001) were most often prescribed in females. Polytherapy was prescribed to most of our patients (81%), more often prescribed to women compared to men (Pearson chi2=8.12, p=0.004).

Table 3 Pharmacological Variables of Our Sample

The Analysis of DAI-30

We obtained an average score of 14.24 (±10.46 SD), with a range between −26 and +30.

In Figure 2, the sum of each item score across patients is shown.

Figure 2 The sum of each DAI-30 item score across patients.

We reported the lowest scores in the items 11, 12, 21 and 24 (Figure 2).

The Cronbach’s alpha coefficient associated with the totality of the 30 items was 0.84, indicating a good reliability and internal consistency of the DAI-30 (item-test correlation=0.14).

Our sample of 300 participants proved to be numerically sufficient for validation analysis, since 10 individuals per item are recommended by most statisticians59 or in accordance with the “Rule of 5” (rule of thumb), which foresees a minimum of 5 individuals per item.60

Our EFA highlighted 3 factors with eigenvalue >1, according to the Kaiser’s criterion,57 able to explain 79% of the variance of our sample. This result was successively confirmed by the scree-plot (Figure 3). On the orthogonal rotation (varimax) (Table 4), all but 14 items of the DAI-30 presented factor loadings >0.40, distributed in the first three factors. As shown in Table 4, the three factors are loaded by 16 items with uniqueness values ranging from 0.38 to 0.70. The first factor, which explains 46% of variance, is loaded by the greatest number of items (7 items out of 30); the second factor, loaded by 5 items, explains 20% of the variance; the third factor, explaining 13% of variance, is loaded by 4 items. The oblique rotation substantially showed that Factors 1, 2 and 3 were positively correlated among themselves and explained 35%, 26% and 25% of variance respectively, for a total variance of 86% (promax matrix).

Table 4 Factor Loadings (>0.40) and Uniqueness of the DAI-30 Items

Figure 3 Scree-plot of DAI-30 factorial analysis.

The three factors we highlighted at EFA indicated the following domains: the first factor, loaded by 7 items, a positive attitude of trust and hope; the second factor, loaded by 5 items, a negative attitude of suspicion and harm; the third factor, loaded by 4 items, a defensive and rational attitude towards drug therapy (Figure 4). Factor 1 showed good (Cronbach’s alpha=0.81) and Factor 2 showed acceptable internal consistency (Cronbach's alpha=0.78), whereas Factor 3 presented questionable internal consistency (Cronbach’s alpha=0.66), just above the minimum threshold of acceptability of item aggregation (0.6), indicating a minor homogeneity of item dimensions.

Figure 4 The three factors of DAI-30.

Further confirmation of the numerical adequacy of our sample for EFA was subsequently obtained by applying the KMO test,58 which returned a value of 0.82, suggestive of a “meritorious” sample (interval between 0.80 and 0.89). The distribution of the sample according to Bartlett’s spherical test was normal and suitable for the application of the EFA (p<0.001).

The Variables Related to DAI-30 Score

We did not highlight any statistically significant difference in the DAI-30 score among patients suffering from a schizophrenic spectrum disorder and all other diagnoses (p<0.001, Skewness/Kurtosis tests; p=0.23, Kruskal–Wallis test) as well as between the two genders (p=0.65, Skewness/Kurtosis tests; p=0.09, t-test).

As shown in Table 5, only three variables are statistically significantly correlated with the final score of the DAI-30 using multiple linear regression (stepwise model):

Table 5 Variables Statistically Significantly Related to the DAI-30 Total and Factor Scores (Stepwise Multiple Linear Regression Model)

  • “married” marital status compared to “single”, in positive correlation (being married increases the DAI-30 score),
  • number of psychiatric hospitalizations from the illness onset, in negative correlation (a lower total number of admissions is associated with higher scores of the DAI-30),
  • monotherapy compared to polytherapy, in negative correlation (monotherapy correlates to potentially worsening perception of drug therapy).

In our stepwise model of multiple linear regression, as seen in Table 5, the variables negatively correlated in a statistically significant way to the three factors of the DAI-30, are the following:

  • number of psychiatric hospitalizations from illness onset and the absence of antipsychotic therapy, with Factor 1;
  • work activity, represented by the status of “student” and “retired for age”, with Factor 2;
  • the absence of treatment in other community services, with Factor 3.

Discussion

This cross-sectional observational 7-month study evaluated the attitude towards drug therapy of people treated at an outpatient psychiatric service using the DAI-30.

The participation of subjects was satisfactory: the average response rate was moderately high, accounting for 63.3% of respondents. The DAI-30 was easy to read and administer, since only some items were difficult to interpret. In particular, an item on which most respondents asked for clarification was no. 24, which in fact obtained the lowest score. All information and clarifications requested were promptly given. The DAI-30 was administered by a researcher other than each patient’s therapist in order to eliminate, as far as possible, a compilation bias.

Our sample is equally distributed between the genders, which show statistically significant differences only in a few socio-demographic and clinical characteristics: women were married and lived in the marital family more often than men, who more frequently remained in their parental family; women were treated with polytherapies and with antidepressants and benzodiazepines more frequently than men. Both these observations overlap those reported in the epidemiological literature.22,61,62

Most respondents were affected by schizophrenic and psychotic spectrum disorders (34%), had suffered from mental disorders for a long time (40% of our respondents had been treated for more than 10 years), were clinically improved at the moment of the DAI-30 administration (83% of cases had not reported any hospitalization in the previous year). 81% of our participants were treated with a polytherapy and 88% with oral therapy, composed of antipsychotics in 66% of cases.

Our study, similar to other studies,50,63 evaluated drug attitude using the DAI-30 in a large sample with heterogeneous diagnoses and care needs, which is representative of the population treated in an Italian outpatient psychiatric service as highlighted by their socio-demographic and clinical characteristics.64 Analysis of the reliability and internal consistency of the DAI-30 questionnaire confirmed that it is a reliable tool (Cronbach’s coefficient associated with the totality of the 30 items is equal to 0.84), as highlighted by other studies.44,45

In accordance with our factorial analysis, the DAI-30 is composed of three factors, supported by 16 items with >0.40 factor loadings, which, albeit fewer, overlap the psychological dimensions of those identified in the first validation (7 factors).44 In particular, the first factor we identified is loaded by the same items which loaded the Factor 1 identified by Hogan et al,44 defined by the DAI-30 authors “Subjective positive experience”; the second factor is loaded by the same 5 items loading the Factor 2 identified by Hogan et al,44 who named it “Subjective negative experience”; our two factors explain the majority of variance (66%) as did the first two factors identified by the DAI-30 authors (75%). Our third factor is loaded by 4 items that indicate a defensive and control attitude about drug therapy; two of these 4 items (items no. 1 and 13) are the same ones that loaded the third factor identified by Hogan et al,44 who defined it “Health/illness”, suggesting the “patients’ models of health”. Our EFA results overlap the Italian validation study,45 although, among the 7 Factors highlighted by this study, only the first two were loaded by most items and explained the majority of the variance. These results confirm DAI-30 validity over time in showing the patients’ attitudes and experiences regarding drug therapy, which is apparently unchanged after 37 years from the inventory construction. Moreover, since we obtained the same results as the DAI-30 authors, who differently from us applied the inventory in a sample of patients affected by schizophrenia, we can infer that the attitude towards drug therapy can be similar in different psychiatric disorders, representing a universal perception and experience of drug therapy.

The overall score obtained (14.24±10.46) in our sample indicates a moderately positive attitude towards drug therapy. It suggests an attitude of trust in drug prescription and, indirectly, in therapeutic relationship with therapists of CMHC. This result is consistent with the literature, which reports higher scores in stabilized outpatient and in long-term care patients, characteristics presented by our participants51,63 and lower scores in hospitalized and/or acute illness patients.14,65 We did not find any statistically significant difference in the DAI-30 score between patients suffering from schizophrenic spectrum disorders and those suffering from all other diagnoses. This result suggests that the attitude evaluated through the DAI-30 is not specific to the individuals affected by schizophrenic spectrum disorders but it is similarly present in patients suffering from other subacute psychiatric disorders treated in an outpatient service.

In our multiple linear regression, two variables, "number of psychiatric hospitalizations from the illness onset" and "monotherapy", were negatively statistically significantly correlated with the DAI-30 score, whereas the marital status “married” was positively statistically significantly correlated with the DAI-30 score. Each of the three factors we identified was significantly and negatively related to different variables, suggesting that “previous psychiatric hospitalizations” and “no antipsychotic drug therapy” could be associated with reduced positive attitude (Factor 1); whereas being “retired for age” and being a “student” could be associated with reduced negative attitude (Factor 2) and no treatment in other community service with reduced defensive and control attitude towards drugs (Factor 3). These results suggest the specificity of the dimensions represented by the three factors that are differently conditioned: the positive attitude (Factor 1) by clinical variables; the negative attitude (Factor 2) by socio-demographic ones; the defensive and control attitude (Factor 3) by organizational ones.

These results are partially in line with the literature. Being married or having a family is a well-known protective factor for the onset and prognosis of various psychiatric disorders either among schizophrenia spectrum30,38 or mood disorders.66,67 Family support has been identified as a protective factor for therapeutic adherence in another study that used the DAI-30.52 The number of previous psychiatric hospitalizations has been identified by most studies as a factor that does not favour a positive attitude towards drug therapy.20,21,26,27,50,68 This correlation indirectly indicates the key role of therapeutic adherence in avoiding repeated hospitalizations with the risk of aggravating the illness course and increasing health care costs.

The positive correlation between polypharmacy and DAI-30 score appears, at first glance, paradoxical and in contrast with what emerged in the literature: the taking of a polytherapy is accompanied by less manageability and greater side effect, is often associated with reduced therapeutic adherence and not recommended by the main international guidelines.6971 The possible efficacy of a polypharmacy regime compared to monotherapy in particular clinical conditions is still a controversial topic in the literature.72 Although international guidelines recommend the prescription of antipsychotics in polypharmacy only as at last step,73 in case of resistance and in particularly severe forms, this practice is very common, particularly in outpatient and long-term settings. The positive attitude towards polytherapeutic regimes shown by our sample can be interpreted in light of the complexity and ambivalence feeling which often characterizes the therapeutic relationship between the patient and the therapists at CMHC. We can hypothesize that patients treated long term in an outpatient setting and in good clinical compensation (as evidenced by the low rate of hospitalizations in the previous year), had developed over time a good acceptability of pharmacological therapy. Moreover, they appeared to show such extreme trust in its efficacy as to overcome the negative counterpart represented by side effects and stigma potentially related to drug therapy. A similar result was recently highlighted by Rej et al63 the Dutch team, using DAI-30 in a cross-sectional study, which showed that 78 patients with bipolar disorder over the age of 60 who were treated with lithium had a more favourable attitude towards drug therapy compared to others not treated with lithium. This result was explained by the authors with the greatest benefit obtained by the positive action of lithium compared to its adverse effects. We hypothesize that in our sample, drug therapy assumed such positive and gratifying, and perhaps magically symbolic values, as to overcome the difficulty of taking complex polytherapy. On the other hand, our results suggest the possibility that a long-term therapeutic relationship, as in our patients, can induce an attitude of relational dependence on the therapist and, indirectly, on drug prescription and administration, and, symbolically, on the whole CMHC. Drugs could represent a symbolic representation of a significant figure such as the physician, if not even a surrogate of the therapists during their absence in a sort of transference phenomenon.74 Our results show that the perception of drug therapy can represent what the patient thinks of disease, the patient’s expectations and hopes, but, at the same time, it expresses how much the therapist is able to accept patient needs in an empathic way. Therefore, drug therapy can represent an ambivalent object, invested by both the patient and the physician with expectations and hope for future improvement. Both drug prescription and administration can assume opposite clinical meanings ranged between the empathic sharing of the patient’s needs and the therapeutic distancing from them, but, in any case, they are aimed at counteracting the disease.74 Drug therapy prescription can represent the climate and the organisation of therapeutic settings, able to modify not only the patient’s condition but also the setting itself. The complex psycho-pharmacological therapeutic relationship does not only modify the clinical effect of the drug, but can strongly condition the patient’s ability to adhere to a treatment plan, in which drug therapy is present as a central and indispensable part.

This leads us to highlight the importance of therapeutic alliance between the patient and the therapist and the need for constant attention to the patient’s internal experience with drug therapies. DAI-30 can be a good predictor of adherence, since it explores the treatment experiences and healing expectations of patients and indirectly puts in evidence their insight and awareness of illness. All these factors together can strongly condition therapeutic adherence, as reported by other studies.43 In accordance with other authors, who proposed a patient-centered model of medication adherence, we report that “first step in finding solutions for nonadherence is understanding patient motives for taking or not taking prescribed medications”. 75

In light of our results, we remind that the patient experience with drug therapy should be periodically but regularly reviewed not only to avoid non-adherence behaviour, but also to reduce the psychological dependence on drug therapy and psychiatric service, which, although initially necessary in many cases in order to implement rehabilitative and psychotherapeutic programs,76 can reinforce regressive tendencies.

Limitations and Advantages of the Study

Our study has some limitations. First, the cross-sectional observational design of this study did not allow us to infer causality among the variables observed. In particular, the heterogeneity of psychiatric clinical disorders in our sample, which implies difference in treatment complexity and therapeutic adherence, makes our results not exhaustively interpretable. Furthermore, the DAI-30 score was not compared with symptom severity or outcome scales or other factors such as therapy interruption or psychiatric hospitalizations, which could have indicated in detail the correlation between disease severity and therapeutic adherence. Other studies focused on correlation between clinical factor and DAI score can deepen its predictability in therapeutic adherence and, indirectly, clinical outcome.

On the other hand, the strengths already mentioned are represented by the sample size and the inclusion in the same sample of patients with different psychiatric diagnoses, representative of the patients treated in our community mental health service.

Conclusions

This study confirms that the DAI-30 is a reliable tool, easy to administer and to understand, which analyses three different dimensions of attitude towards drug therapy: trust and hope, suspicion and fear of harm, defence and control, in accordance with our factorial analysis.

We highlighted a good emotional and therapeutic atmosphere in our CMHC, suggested by the positive score of the DAI-30 and the high rate of participation in the study, both potential indicators of therapeutic adherence. The correlations between the DAI-30 scores and the selected socio-demographic and clinical variables indicate that the positive attitude towards drug therapy can be reinforced by family support and reduced by relapses with hospitalization, as literature has highlighted. Paradoxically, in our sample, polytherapy favoured a positive attitude towards drugs. This last result suggests a sort of psychological dependence on drug therapy and, indirectly, on psychiatric service, that can be explained by the long-term treatments of our patients.

Our results lead us to reflect on the risks of dependence on drugs, especially in long-term treatments in a community service setting. Therapists must be aware of this risk and constantly monitor drug prescription within the therapeutic relationship. The meaning that drug therapy assumes for the patient should be correctly and periodically re-evaluated by all members of the multidisciplinary team of a community psychiatric service. In particular, the attitude towards drugs can be an important indicator not only of the patient’s expectations and illness awareness, but also of the therapists’ ability to create a non-stigmatizing therapeutic relationship aimed at the patient’s autonomy and responsibility.

Future longitudinal studies are necessary to deepen the understanding of such a complex and multifactorial phenomenon as the attitude towards pharmacological therapy in order to implement more appropriate strategies to prevent the patients’ abandonment of treatments and, at the same time, their dependence on therapy and psychiatric service.

Disclosure

The authors report no actual or potential conflicts of interest.

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