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Curbing excess gestational weight gain in primary care: using a point-of-care tool based on behavior change theory

Authors Piccinini-Vallis H, Vallis M

Received 28 April 2018

Accepted for publication 26 July 2018

Published 11 October 2018 Volume 2018:10 Pages 609—615

DOI https://doi.org/10.2147/IJWH.S172346

Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Professor Elie Al-Chaer

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Helena Piccinini-Vallis, Michael Vallis

Department of Family Medicine, Dalhousie University, Halifax, NS, Canada

Introduction: Excess gestational weight gain (GWG) is a risk factor for several adverse outcomes for mothers and their offspring. In Nova Scotia, Canada, approximately 60% of women experience excess GWG. Outside the pregnancy arena, a patient-centered approach has been shown to promote increased patient adherence to clinician recommendations, and increased intentions for, and attempts at, behavior change. The 5As of Healthy Pregnancy Weight Gain is a tool that assists clinicians to have patient-centered discussions about GWG. This feasibility trial examined the association between training in the use of this tool and women’s self-efficacy to manage GWG, readiness to adhere to GWG guidelines, perception of their clinicians’ patient-centeredness when discussing GWG, and guideline concordance of total GWG.
Method: Participants were 11 family physicians who provide prenatal care and 24 of their patients who were pregnant. Physicians were randomly assigned to a single 60-minute training session in the use of the tool or usual care. Consenting patients completed measures of social support, stress, patient-perceived patient-centeredness, self-efficacy, and motivation. At the end of each woman’s pregnancy, data pertaining to guideline concordance of GWG were collected.
Results: Comparison of patient participants with prenatal care providers in the trained and untrained groups showed no significant difference in patient-perceived physician patient-centeredness when discussing GWG, self-efficacy to manage GWG, readiness to adhere to GWG guidelines, or GWG congruence with the guidelines.
Conclusion: This feasibility study required very little time commitment and entailed minimal disruption to clinicians’ practices. Nonetheless, it was very difficult to recruit clinicians for the study. Although recent theory-driven work showed that prenatal care providers have, overall, high perceived self-efficacy in discussing GWG with their patients, most studies have demonstrated that these providers do not often discuss GWG with their patients; so, there is clearly a mismatch in their perceived self-efficacy and what actually transpires.

Keywords: weight gain in pregnancy, prenatal care providers, patient-centeredness, counseling

Introduction

Excess weight gain in pregnancy is a risk factor for a number of short- and long-term adverse outcomes for mothers and their offspring.13 Between 2005 and 2014, approximately 60% of women delivering at term in Nova Scotia, Canada, gained weight in excess of the Institute of Medicine (IOM) guidelines.4,5 These guidelines6 are based on prepregnancy body mass index (BMI) categories and include weekly recommendations for gestational weight gain (GWG).68 A number of factors influence guideline concordance of GWG, including unhealthy lifestyle behaviors, lack of clinician or patient knowledge about how much weight should be gained,9,10 maternal age, parity, prepregnancy BMI, smoking, income, and education.11,12 A clinician’s advice also potentially influences GWG,13,14 although this has not been a consistent finding.1517 One common limitation of existing studies is that “advice” is not operationalized and may refer simply to the clinician addressing the patient in a prescriptive manner. While this clinician-centered approach might increase patient knowledge, it does not necessarily translate into patient behavior change.18 In contrast, a patient-centered approach incorporating motivational and behavior change strategies promotes increased patient acceptance of and adherence to recommendations, as well as increased intentions for, and attempts at, behavior change.1921 This approach involves the clinician striving to understand the whole person, explore the patient’s illness experience, find common ground, and cultivate the clinician–patient relationship in order to address the barriers to initiating and sustaining behavior change.22,23 A patient-centered approach has been shown to improve patient outcomes and decrease costs to the health-care system.2426 In one recent meta-analysis, physician patient-centeredness increased the odds of adherence by 2.16.27 Patient-centeredness can be operationalized and is measurable from a clinician, observer, or patient perspective,28,29 the latter being most significantly associated with improved health outcomes.30,31

Patients want their primary care physicians to address weight-related issues.32 Although the unique relationship these clinicians have with their patients should be facilitative, such discussions occur infrequently.33,34 Clinicians perceive several barriers to discussing weight-related matters, including a threat to the patient–clinician relationship, and perceived lack of competence, time, and remuneration.3538 Training in behavior change counseling potentially addresses some of these perceived barriers3941 and improves patients’ health behaviors and health outcomes.42,43 However, no research has been published on training providers to counsel on pregnancy-related weight gain specifically – a recent systematic review in this area did not identify a single trial.44 Evidence outside of the GWG arena suggests that clinicians trained in behavior change counseling struggle to use these skills due to the demanding nature of such counseling from a time management point of view as well as perceived complexity.45

Point-of-care tools provide less intensive alternatives to behavior change counseling and may address issues associated with lack of skill and confidence.46 An example of a point-of-care tool is the 5As of Obesity Management.23 This tool, based on principles of behavior change science and patient-centeredness, assists clinicians to engage in conversations about weight-related behavior change with their patients in a systematic manner that incorporates the patient context.47 Pilot data on the use of this tool have shown a twofold increase in the initiation of weight-related discussions between healthcare providers and their patients.48 Our team was instrumental in the development, dissemination, and initial evaluation of this tool, and Dr Piccinini-Vallis led a national multidisciplinary endeavor to adapt it to pregnancy, which resulted in the 5As of Healthy Pregnancy Weight Gain tool (5As HPWG).49

We are part of a national Canadian research group exploring the potential use of the 5As HPWG in prenatal care. The aim of the current proof-of-concept study50 was to collect data about training in the use of the 5As HPWG in Halifax, NS, Canada.

Research questions

  1. How does training family physicians in the use of the 5As HPWG compare to usual care in terms of:
    1. women’s perception of their family physicians’ patient-centeredness when discussing GWG;
    2. women’s perceived self-efficacy to manage GWG;
    3. women’s readiness to adhere to GWG guidelines;
    4. the guideline concordance of women’s total GWG?

Method

This study was a pragmatic randomized feasibility trial. Ethics approval was obtained from the Capital District Health Authority Research Ethics Board in Halifax, NS, Canada (file number CDHA-RS/2OI5-277). The trial was registered at ClinicalTrials.gov (registration number NCT02174809).

Participants and setting

All participants provided written informed consent. Participants were family physicians in Halifax, NS, Canada, who provide prenatal care, and their patients at least 18 years of age who were able to speak English, had a singleton pregnancy, and a normal 18-week ultrasound. In Halifax, most women with uncomplicated, low-risk pregnancies as just described receive prenatal care in a primary care setting, typically by family physicians.

Participant enrolment

Physicians in Halifax were recruited primarily by personal contact by the investigators, as well as through fax and email. Although recruitment of physicians for research is notoriously difficult, we believed that the fact that the investigators were known to the small “network” of physicians who provide prenatal care within the target region would increase the chances of successful recruitment to as high as 50%–70%.51,52 Consenting physicians were randomly assigned to training in the use of the 5As HPWG (trained group) or usual care (untrained group). The limited population of potential physician participants necessitated this study to be considered a proof-of-concept study in a defined population. As there was some chance of cross-contamination, those in the trained group were instructed not to discuss the 5As HPWG with other physicians.

Consenting physicians were randomized to the trained or untrained group on the basis of a random number generator. The trained group obtained a single 60-minute in-person training session in the use of the tool. They were shown four videos demonstrating the use of the 5As HPWG with progressively more challenging patients. In addition, they received a paper copy of the 5As HPWG and a desktop dodecahedron illustrating the 5As HPWG. While the training was brief, it was based on a comprehensive training program developed by the Behavior Change Institute at the Nova Scotia Health Authority, described elsewhere.53 Physicians in the untrained group received no intervention. All physicians identified potential patient participants (at least 18 years old, ability to speak English, singleton pregnancy) on receipt of a normal routine18–20 week ultrasound report and advised these women of the study at their next prenatal appointment.

Data collection

Upon enrolment, consenting patients completed a brief questionnaire on demographic items: age, parity, smoking, height, and prepregnancy weight.54 The height (m) and prepregnancy weight (kg) measures were used to calculate prepregnancy BMI (kg/m2), which were then categorized by range as follows: <18.5, 18.5 to <25.0, 25.0 to <30.0, ≥30.0. Participants also completed measures of social support (ENRICHD Social Support Instrument),55 stress (Perceived Stress Scale),56 patient-perceived patient-centeredness (a version of the 14-item validated Patient-Perceived Patient-Centeredness Questionnaire29 adapted for discussions about GWG), and two behavior change constructs: self-efficacy (General Self-Efficacy Scale,57 modified for the context of GWG), and motivation (ie, readiness to adhere to GWG guidelines, using the BCI Traffic Light Assessment,58 a validated scale developed by our team). The latter measurement categorized participants’ readiness into “ready”, “ambivalent”, and “not ready”.

At the end of each participant’s pregnancy, data pertaining to the outcome variable (GWG concordance with the guidelines) were collected. Both the last measured weight during pregnancy and the corresponding gestational week were extracted from each patient’s prenatal record after delivery. GWG concordance with the 2009 IOM guidelines6 was determined by comparing the total GWG to the guideline recommendations by prepregnancy BMI category. Data were entered into an electronic form and analyzed using SPSS 24.

Results

Sample

Fifteen family physicians were approached and eleven consented to participate in the study (73%), and five of these physicians were randomized to receive training in the use of the 5As HPWG. A total of 26 patient participants were enrolled, with an average of 3 participants per physician. Of these participants, 11 (42.3%) had physicians who were in the trained group.

One participant developed gestational diabetes and one was lost to follow up. These two participants were therefore not included in any further analyses and the total sample was reduced to 24 participants, including 10 participants (41.7%) with physicians in the trained group.

Patient characteristics

The mean age of participants was 32.4 years (SD 3.1, range 28–40) and the mean prepregnancy BMI was 25.0 (SD 3.5, range 19.7–36.3); 70.8% were nulliparous, 16.7% were primiparous, and 12.5% were multiparous; 54.2% had a prepregnancy BMI that fell in the 18.5 to <25.0 range, 37.5% had a prepregnancy BMI that fell in the 25.0 to <30.0 range, and 8.3% had a prepregnancy BMI >30.0; the majority of participants (91.7%) did not smoke. These women all had family physicians in an urban community; however, no variables pertaining to socioeconomic status (SES) were collected.

On a scale of 14 (lowest stress) to 70 (highest stress), the mean perceived stress of women was 33.1 (SD 9.7, range 20–51). The mean perceived social support, on a scale of 7 (lowest support) to 35 (highest support), was 27.3 (SD 3.6, range 19–34).

The mean patient-perceived patient-centeredness when discussing GWG, on a scale of 1 (lowest patient-centeredness) to 4 (highest patient-centeredness), was 2.53 (SD 0.47, range 1.86–3.43). The mean perceived self-efficacy to manage GWG among participants, on a scale of 10 (lowest self-efficacy) to 40 (highest self-efficacy), was 30.2 (SD 4.7, range 18–37). Approximately half of the participants (54.2%) rated their readiness to adhere to GWG guidelines as “ambivalent”, 41.7% were “ready”, and 4.2% were “not ready”.

There was a significant correlation between perceived stress and perceived social support (r=−0.463, P=0.023), and between perceived stress and perceived self-efficacy to manage GWG (r=−0.703, P=0.000). There was a significant correlation between perceived social support and perceived self-efficacy to manage GWG (r=0.593, P=0.002). ANOVA showed no significant relationship between readiness to adhere to GWG guidelines and perceived social support, perceived stress level, perceived self-efficacy to manage GWG, and patient-perceived patient-centeredness when discussing GWG.

All women delivered at term (≥37 weeks’ gestation), with over half delivering at 40 weeks’ gestation. The mean GWG was 14.9 kg (SD 4.4, range 6.7–25.5). One participant gained insufficient weight, one-third of the sample (33.3%) had guideline-congruent GWG, and slightly less than two-thirds of the sample (62.5%) experienced excess GWG.

Baseline variables were examined for normality (kurtosis and skewness), and nonnormally distributed variables were analyzed using nonparametric analyses (Mann–Whitney tests). Mean age, prepregnancy BMI, and measures of perceived stress and perceived social support were compared between the participants of trained and untrained physicians; chi-square analysis was used to compare these participants’ parity, prepregnancy BMI category, and smoking (Table 1).

Table 1 Comparison of baseline data between participants with physicians in experimental and control groups
Abbreviation: BMI, body mass index.

There was a significant difference in perceived social support between the groups, with participants whose physicians were in the trained group rating their perceived social support as being lower than those with physicians who were in the untrained group.

Impact of physician training

As shown in Table 2, comparison of patients in the trained and untrained groups showed no significant difference in mean patient-perceived patient-centeredness when discussing GWG and no significant difference in their mean perceived self-efficacy to manage GWG. Similarly, there was no significant relationship between physician training and readiness to adhere to GWG guidelines or women’s GWG congruence with the guidelines.

Table 2 Impact of physician training on patient outcomes
Notes: The ranges for the scores are explained in the “Patient characteristics” section. For patient-perceived patient-centeredness the range is 1–4. For perceived self-efficacy, the range is 10–40.
Abbreviation: GWG, gestational weight gain.

Predictors/correlates of GWG concordance with the guidelines

As shown in Table 3, women with GWG that was concordant with the 2009 IOM guidelines6 had significantly higher perceived self-efficacy to manage GWG and reported significantly lower perceived stress compared with women who experienced guideline-discordant GWG. However, they did not rate their physicians’ patient-centeredness when discussing GWG or their readiness to manage GWG as significantly different.

Table 3 Predictors and correlates of GWG concordance with the guidelines
Notes: The ranges for the scores are outlined in the “Patient Characteristics” section. The range for perceived self-efficacy is 10–40. The range for stress level is 14–70. The range for patient-perceived patient centeredness is 1–4.
Abbreviation: GWG, gestational weight gain.

Discussion

The main purpose of this feasibility study was to evaluate how incorporating a minimal intervention approach for behavior change counseling, the 5As HPWG, could increase the likelihood of guideline-concordant GWG. However, the study was underpowered and we were unable to demonstrate any difference in patient outcomes with the brief training that was undertaken in this study. Specifically, training in the use of the 5As HPWG did not result in an increase in patient-perceived patient-centeredness when discussing GWG, patient perceived self-efficacy to manage GWG, readiness to adhere to GWG guidelines, or GWG congruence with the guidelines. However, patients in the trained group had significantly lower perceived social support than patients in the untrained group, which could have affected their self-efficacy to manage GWG, as there was a significant positive correlation between these two variables. A post-hoc analysis was therefore undertaken comparing patients in the trained and untrained groups on self-efficacy to manage GWG and controlling for perceived social support. The results showed no difference in self-efficacy to manage GWG between the two groups.

Women who experienced guideline-concordant GWG reported significantly higher perceived self-efficacy to manage GWG and significantly lower perceived stress than women who gained excess weight. However, post-hoc analysis comparing guideline concordance and covarying for pre-pregnancy BMI found that women with guideline-concordant GWG had higher perceived self-efficacy to manage GWG (6.283; P=0.02). Comparison of guideline concordance, covarying for prepregnancy BMI, found that women with guideline-concordant GWG experienced lower perceived stress (f=4.675, P=0.042). Therefore, it appears that self-efficacy enhancement and stress management may play a role in facilitating guideline concordance of weight gain during pregnancy. These results would justify a trial intervention evaluating psychological interventions that would promote these constructs.

One significant threat to the internal validity of this study is the issue of fidelity and competency on the use of the 5As HPWG. Our experience of delivering the training was that physician participants were not highly engaged in the implementation aspect of the tool. Training sessions were often scheduled late in the day and providers presented as distracted and were not receptive to in session role-plays in the use of the tool. Most providers stated that they were comfortable in using such tools. Lack of effective training compromises the integrity of the intervention. Campbell et al commented on the limitation in behavioral studies of not assessing fidelity and competency in the training in the intervention.59

Limitations of the study

There are a number of limitations in this study. First, this feasibility trial was underpowered to detect an effect, so firm conclusions cannot be drawn. Second, pertaining to this study, women received advise on GWG from their family physician at or just after 24 weeks’ gestation. This is late in the second trimester and probably too late to have a significant impact on the amount of weight that they actually gain. Third, all the women attended practices in an urban region and could possibly have, based on their mean age and mean prepregnancy BMI, a higher SES. However, variables pertaining to SES were not collected.

Conclusion

This feasibility study required very little time commitment and entailed minimal disruption to the family physicians’ practices. Nonetheless, it was very difficult to recruit family physicians for the study. Recent work based on Self-Efficacy Theory38 showed that prenatal care providers have very high perceived self-efficacy in discussing GWG with their patients under most circumstances, so perhaps it is not surprising that the intervention in the present study was unsuccessful in effecting any change at the patient level. However, most work in this area has demonstrated that prenatal care providers in fact do not engage in discussions about GWG with their patients, so there is clearly a mismatch in provider perceived self-efficacy and what actually transpires.

Acknowledgment

This work was supported by a grant from the Capital Health Research Fund for 2015–2017.

Disclosure

Dr Piccinini-Vallis has been a consultant for Novo Nordisk. Dr Vallis is a consultant and is on advisory boards for Novo Nordisk, Sanofi, and Valeant, and receives speaker’s fees from Novo Nordisk, CSL Behring, Sanofi, Pfizer, Valeant, and Merck. The authors report no other conflicts of interest in this work.


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