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Clinical Characteristics of Pesticide Self-Harm as Associated with Suicide Attempt Repetition Status

Authors Huang WC , Yen TH , Lin L, Lin C , Juang YY, Wang BH, Lee SH

Received 17 April 2020

Accepted for publication 28 June 2020

Published 16 July 2020 Volume 2020:16 Pages 1717—1726


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Yuping Ning

Wei-Chen Huang,1 Tzung-Hai Yen,2,3 Long Lin,4 Chemin Lin,3,5,6 Yeong-Yuh Juang,7 Bi-Hwa Wang,8 Shwu-Hua Lee1,3

1Department of Psychiatry, Chang Gung Memorial Hospital, Linkou, Taiwan; 2Department of Nephrology and Clinical Poison Center, Chang Gung Memorial Hospital, Linkou, Taiwan; 3School of Medicine, College of Medicine, Chang Gung University, Taoyuan, Taiwan; 4School of Traditional Chinese Medicine, College of Medicine, Chang Gung University, Taoyuan, Taiwan; 5Department of Psychiatry, Chang Gung Memorial Hospital, Keelung, Taiwan; 6Community Medicine Research Center, Chang Gung Memorial Hospital, Keelung, Taiwan; 7Department of Psychiatry, Koo Foundation Sun Yat-Sen Cancer Center, Taipei, Taiwan; 8School of Nursing, College of Medicine, Chang Gung University, Taoyuan, Taiwan

Correspondence: Shwu-Hua Lee
Department of Psychiatry, Chang Gung Memorial Hospital, 5 Fu-Shin Road, Kwei-Shan, 333, Linkou, Taiwan
Tel +886 3 3281200 Ext 2439
Fax +886-3-3280267
Email [email protected]

Purpose: Previous suicide behavior predicts future suicide risk. Studies of suicide repetition are important for suicide prevention. This study examined the clinical characteristics and psychiatric comorbidities of pesticide self-harm as associated with suicide attempt repetition status.
Patients and Methods: This retrospective, observational study included patients admitted to a medical center in northern Taiwan between 2000 and 2015 following suicide attempts by pesticide. Diagnoses were made by a consultation-liaison psychiatry team based on the DSM IV-TR criteria. Independent samples t-test was used to analyze the quantitative variables and Pearson’s Chi-squared test with a Bonferroni adjustment for categorical variables. Univariate binary logistic regression analysis was conducted to determine the predictors for repeated suicide attempt and multivariate binary logistic regression analysis to identify significant associated factors.
Results: Among 151 patients, organophosphate pesticides were the most used (80.8%). The average age was 52.9± 17.2 years. Most patients were married males from rural areas, with depressive disorder most often diagnosed (40.4%). Nearly one-third of them were suicide repeaters (n=43, 28.5%); these patients were less likely to be married (53.5%, p=0.001), had previously used psychiatric services (72.1%, p< 0.001) and chose complex suicide (46.5%, p=0.014) more often compared to nonrepeaters. No significant differences were found between repeaters and nonrepeaters regarding psychiatric comorbidities. Multivariate logistic regression analysis revealed that marital status (odds ratio: 2.916, 95% confidence interval: 1.234– 6.891, p=0.015) and previous psychiatric services usage (odds ratio: 6.897, 95% confidence interval: 3.012– 15.625, p< 0.001) were significant risk factors associated with suicide repetition.
Conclusion: Pesticide suicide repeaters were characterized by less likely to be married and more likely to use psychiatric services before suicide attempts. These features help ensuring that the needs of people who have made a suicide attempt are addressed, and it reduces the likelihood of repetition.

Keywords: self-harm behavior, self-poisoning, intentional poisoning, organophosphate


Approximately 800,000 people die by suicide every year (World Health Organization, 2020). Although previous meta-analysis failed to distinguish patients with a high suicide risk group,1 knowing the characteristics of suicide repeaters can still help psychiatrists providing a patient-centred care, ensuring that the needs of people who have made a suicide attempt are addressed. A systemic review analyzing repeaters by different suicide means revealed characteristics of unemployment, unmarried status, psychiatric illness.2 While focusing on the study of repeaters by self-poisoning, they were female predominant and having previous psychiatric treatment, they tend to choose antidepressants overdose.3 Another study showed no gender significance between repeaters and nonrepeaters groups, yet alcohol use disorder was seen more in male repeaters.4

Pesticide self-poisoning is one of the most used methods of suicide globally. Although there has been a decline in lethal pesticide self-poisoning in recent years, pesticide self-poisoning remains an important public health issue, accounting for approximately 14% of suicide death worldwide.5 According to a systemic review conducted by Gunnel et al,6 national bans on highly lethal pesticides are effective in reducing overall suicide mortality rates, the reducing trend was also observed in Taiwan. Pesticides with a lower toxicity are still dangerous due to their easy accessibility, in a study conducted by Lin et al,7 the mortality rate of organophosphate exposure, which is the most used insecticide throughout the world and is widely used in Taiwan, could be as high as 12.71%, once patients are in respiratory failure and are mechanically ventilated, the mortality rate can rise to 50%.8 In a study by Sahin et al,9 suicide attempters who chose organophosphates were female predominant, 51.8% were unmarried, they had a mean age of 22.1±9.2 years, and 76.8% of them were younger than age 24.

There is a paucity of studies in the literature examining psychiatric comorbidities or suicide repetition in patients who have attempted suicide by pesticide. In a review article, Carrol et al reported that fewer Asian patients attempted suicide by pesticide at risk of repetition comparing to European patients,10 nevertheless, a 2019 prospective cohort study in Sri Lanka showed 48.7% of suicide repeaters by pesticide chose pesticide again in repeated attempts.11 In a study of 39 Fiji patients who attempted suicide mostly by drug and pesticide ingestion, Aghanwa12 reported that social problems and psychiatric comorbidities were noted in 64.1% of cases. Our previous study13 of 157 Taiwanese patients who attempted suicide by paraquat ingestion revealed that mood disorders (54.0%) were the most common psychiatric comorbidities.

To our knowledge, a study of suicide repeaters by pesticide is lacking. Therefore, the objective of this retrospective, observational study was to examine the clinical characteristics and psychiatric comorbidities of patients who attempted suicide by organophosphates, carbamates or glyphosates and analyze the variations in these parameters between repeaters and nonrepeaters.

Patients and Methods

Ethical Statements

This retrospective, observational study followed the Declaration of Helsinki and was approved by the Medical Ethics Committee of Chang Gung Memorial Hospital, Taiwan (Institutional Review Board number 201800245B0). The IRB waived the need for specific informed consent from the patients because this was a retrospective study based on case research or cases treated or diagnosed by clinical routines without enrollment of HIV positive cases. The confidentiality of each patient's data was kept.


Data Collection from Clinical Records

Between January 1, 2000, and December 31, 2015, a total of 151 patients who attempted suicide by pesticide received a consultation-liaison psychiatry evaluation at Chang Gung Memorial Hospital (CGMH), Linkou, Taiwan. At CGMH, it is routine clinical practice for patients who attempt suicide to have a formal consultation-liaison psychiatry evaluation. All patients who attempted suicide by pesticide and received a complete consultation-liaison psychiatry evaluation at CGMH were analyzed. We reviewed the medical records, which included emergency department records, admission, progress and discharge records, nursing records, psychiatric consultation records, and psychiatric outpatient clinical records. After reviewing all records, psychiatric diagnosis was made using the DSM IV-TR criteria. Demographic data such as age, gender, and job were recorded, along with the patients` systemic disease and adverse outcome of pesticide poisoning, including intubation or aspiration pneumonia, but excluding death. All laboratory findings available in the aforementioned medical records were documented, which included serum acetylcholinesterase (AChE) levels (reference level: 7000–19,000 U/L) during the hospital stay (both emergency department and ward admission), and we only recorded the nadir AChE level. The clinical courses of organophosphate and carbamate intoxication include acute cholinergic crisis following cholinesterase depression, intermediate syndrome with unclear mechanism, and delayed polyneuropathy caused by the suppression of neuropathy target esterase.14 Therefore, the nadir serum AChE levels have been used as a biomarker of acute cholinergic crisis. The pesticide brand used for suicide was recorded in the medical record, and we categorized them into three groups (organophosphate, carbamate, glyphosate) according to the 2018 Taiwan official pesticide guideline. The reason for choosing organophosphate, carbamate and glyphosate is they are the top three most heavily used pesticides for self-poisoning in Taiwan.15 When suicide attempters used two or more means of suicide or used two or more toxins in ingestion, it was recorded as a complex suicide.16

Detoxification Protocols

Organophosphate and carbamate patients were treated with gastric lavage with 2 L of normal saline, followed by 1 g/kg activated charcoal and 250 mL magnesium citrate infused via nasogastric tube.17 Magnesium citrate was used to prevent constipation after charcoal therapy. Since all organophosphate and carbamate patients had depressed serum cholinesterase levels, they were treated with antidotes that included anticholinergic and oxime drugs. Intravenous atropine was initiated at 2 mg every 1–2 hours and titrated to the resolution of bronchial secretions and bronchospasm. Pralidoxime therapy (1 g every 4 hours, intravenous) was also prescribed to patients with cholinergic crisis. Glyphosate patients were intensively treated by gastric lavage with a large amount of normal saline followed by active charcoal and magnesium citrate administration. There is no specific antidote available for glyphosate poisoning, and its management is mainly symptomatic and supportive.

Statistical Analysis

Continuous variables were documented as the means and standard deviations, and categorical variables were documented as numbers and percentages. All medical factors related to mortality and morbidity were selected by the nephrologist based on clinical and existing knowledge about organophosphate intoxication. We used SPSS version 22 (Statistical Product and Service Solutions) to perform all statistical analyses. We used Pearson’s Chi-squared test with a Bonferroni adjustment and independent samples t-test to assess associations as appropriate. Univariate binary logistic regression analysis was performed to analyze the predictors for repeat suicide attempt. To control for confounding factors, multivariate binary logistic regression analysis was performed to analyze the significant predictors after univariate analysis. An effect size with its corresponding 95% confidence interval (CI) was calculated for significant associations. The p-values were recorded as two-sided, and the significance level was set at 0.05.


Baseline Demographics

Race-ethnicity of our all patients was Taiwanese. As shown in Table 1, organophosphates were the most commonly used pesticide (80.8%), followed by glyphosates (10.6%) and carbamates (8.6%). The mean age of the patients was 52.9±17.2 years and most were male (69.5%) and married (72.2%). Although 96.7% of patients had a past psychiatric diagnosis, only 38.4% had used psychiatric services, and 15.2% had used our psychiatric outpatient clinic before this suicide attempt. One-third of the patients (31.8%) attempted complex suicide. Most of the patients (79.5%) were from rural areas, and 45% of the patients were unemployed. Some patients suffered from a chronic systemic disease, including hypertension (23.8%), diabetes mellitus (9.9%), and hepatic disease (9.3%).

Table 1 Baseline Demographics of Patients with Pesticide Poisoning, Stratified into Two Subgroups According to Suicide History as Repeaters and Nonrepeaters (n=151)

A total of 43 (28.5%) patients reported a previous suicide attempt and were classified as suicide repeaters (repeaters), while the other 108 (71.5%) patients were classified as suicide nonrepeaters (nonrepeaters). Repeaters were less likely to be married (53.5%, p=0.001), previously used psychiatric services (72.1%, p<0.001), and chose complex suicide (46.5%, p=0.014) more often compared to nonrepeaters. In Table 2, it showed 54.2% who chose complex suicide applied alcohol intoxication, 27% applied illicit drug or other medication overdose. In addition, there were some trends among repeaters and nonrepeaters, although there were no significant differences, including age (repeaters 49.3±15.2 years, nonrepeaters 54.3±17.8 years, p=0.104), rate of visiting our psychiatric outpatient clinic before this suicide attempt (repeaters 23.3%, nonrepeaters 12%, p=0.083), and time elapsed between poisoning and hospital arrival (repeaters 354.0±389.6 minutes, nonrepeaters 245.4±238.3 minutes, p=0.055).

Table 2 Methods Used in Complex Suicide of Patients with Pesticide Poisoning, Stratified into Two Subgroups According to Suicide History as Repeaters and Nonrepeaters (n=48)

Clinical Manifestations and Laboratory Findings

Table 3 shows that pesticide intoxication produces many serious systemic complications, including acute respiratory failure (49.7%), aspiration pneumonia (39.7%), sepsis (3.3%), seizure (3.3%), hypoxic encephalopathy (3.3%), and gastrointestinal bleeding (3.3%). The mean hospitalization duration was 18.6±15.2 days. After discharge, 49.7% of the patients were regularly followed at our psychiatric outpatient clinic, and the mean follow-up period was 998.7±1561.4 days. Overall, there were no significant differences in the clinical manifestations and laboratory findings between repeaters and nonrepeaters (Tables 3 and 4), although some trends could be observed, including the follow-up rate at our psychiatric outpatient clinic after discharge (repeaters 58.1%, nonrepeaters 46.3%, p=0.189) and the follow-up duration at our psychiatric outpatient clinic after discharge (repeaters 780.4±1470.9 days, nonrepeaters 1103.3±1607.5 days, p=0.419), serum AChE level (repeaters 3058.6±5140.2 U/L, nonrepeaters 1897.8±2870.2 U/L, p=0.087).

Table 3 Clinical Manifestations of Patients with Pesticide Poisoning, Stratified into Two Subgroups According to Suicide History as Repeaters and Nonrepeaters (n=151)

Table 4 Laboratory Findings of Patients with Pesticide Poisoning, Stratified into Two Subgroups According to Suicide History as Repeaters and Nonrepeaters (n=151)

Predictors for Repeated Suicide Attempt

As shown in Table 5, multivariate logistic regression analysis revealed that marital status (odds ratio: 2.916, 95% confidence interval: 1.234–6.891, p=0.015) and previous psychiatric services usage (odds ratio: 6.897, 95% confidence interval: 3.012–15.625, p<0.001) were significant risk factors associated with repeated suicide attempt.

Table 5 Prediction of Suicide Repetition Using Logistic Regression Analysis (n=151)

Psychiatric Comorbidities

Psychiatric comorbidities are listed in Table 6. Psychiatry consultation-liaison evaluations revealed that depressive disorder, substance use disorder and adjustment disorder were present in 66.9%, 30.5% and 15.2% of cases, respectively. In addition, among all substance users, 84.8% had an alcohol use disorder. For psychiatric comorbidities, there were no significant differences between repeaters and nonrepeaters, but some trends could be observed, including adjustment disorder (repeaters 7.0%, nonrepeaters 18.5%) and alcohol use disorder (repeaters 34.9%, nonrepeaters 22.2%).

Table 6 Psychiatric Comorbidities of Patients with Pesticide Poisoning, Stratified into Two Subgroups According to Suicide History as Repeaters and Nonrepeaters (n=151)


This study analyzed the characteristics of 151 patients who attempted suicide by pesticide and presented to hospital. Of these, 28.5% reported a previous suicide attempt (suicide repeaters). Half of the repeaters were not married, and they used more psychiatric services before this admission, which may indicate that if repeaters could be identified earlier, suicide repetition may be preventable.

Our study revealed 80.8% of suicide attempters used organophosphate as their suicide toxin, it reflected that organophosphate is commonly used pesticide in Taiwan. In a retrospective study that included 47 patients, 74.4% had respiratory failure,18 compared to 51.6% in our group, this may indicate the severity of our poisoning might be lower, it may be bias that we only recruited survived patients in our study. American research failed to show net-benefit of banning organophosphates and carbamates through risk-trading off analysis19 because even the acute toxicity may decrease, effect of change on diet may be hard to be estimated. There was no significant difference between repeaters and nonrepeaters regarding which pesticide they chose, even the trend observed in serum AChE level may suggest organophosphate was chosen more in nonrepeaters; our patients might not choose their suicide toxin specifically since they possibly could not tell the difference in toxicity between these three pesticides. Nevertheless, further study may be warranted to know their choosing process, in order to make patient-centred plan about suicide prevention.

In this study group, most patients were married (72%). This proportion is higher than that of our previous study (52.9%),13 which may be due to some group differences; for example, our patients lived mostly in rural areas, where more people are married. There was statistical significance regarding marriage between repeaters and nonrepeaters (p=0.001), repeaters were less likely to be married (53.5%), they were more likely to be single, divorced or widow. This corresponds to previous systemic review about suicide repetition by suicide means other than pesticide.2 As indicated by a previous study, divorce was a risk factor for suicide death,20 and the opposite may be true for marriage – it may be a protective factor. In a Tunisian study,21 it was revealed that a higher percentage of repeaters were divorced or separated compared to nonrepeaters. A study that focused on cultural differences stated that Asian women may not benefit from marriage as Western females do,22 but support from their partner still played an important role to repeaters in our study. One previous study demonstrated gender and age differences in that divorced males showed a stronger effect size for suicide propensity, while females who were never married, aged below 35 or older than 65 had lower suicide odds.20 Due to the small sample size, gender and age subgroups were not analyzed in our group of repeaters. For patients not married, psychosocial support is indicated.

Thirty-eight percent of our patients had previously used psychiatric services, mostly in the outpatient department. Lin et al23 studied 468 Taiwanese patients who visited the ER for suicidal behavior and found that 53.6% had previous psychiatric intervention. The lower proportion found in our study group might be because the patient group in Lin’s study came from a metropolitan area where more psychiatric services are available. The follow-up rate in our psychiatric outpatient department was 49.7%, while only 26.1% of patients visited the outpatient department after discharge in Lin’s study,23 which may be due to our study protocol only including patients who received a psychiatric consultation; therefore, a higher follow-up rate was expected. As many as 72.1% of repeaters had previously used psychiatric services (p<0.001); since they had previously attempted suicide, they might have been exposed to psychiatric resources earlier than nonrepeaters, including an ER psychiatric consultation or being referred by another specialty to a psychiatric outpatient, psychotherapy or psychiatric ward admission. Lin’s study also revealed that the number of psychiatric admissions of repeaters was more than that of nonrepeaters,23 which may indicate that repeaters presented a more severe psychopathology. Repeaters had a trend of shorter follow-up duration in our psychiatric outpatient department compared to nonrepeaters (p=0.419), which might be because a higher proportion of repeaters tend to have more cluster B personality traits,24 which makes it hard for them to maintain a therapeutic relationship. If the need of suicide repeaters can be discovered and ensured earlier when they encounter psychiatric service, repeated suicide attempts might be preventable.

The rate of our patients having a psychiatric diagnosis was 96.7%, this could be due to the selection bias of our study, since our inclusion criteria required a psychiatric consultation or outpatient department record. The most presented diagnosis was depressive disorder (66.9%), which included major depressive disorder, dysthymic disorder and unspecified depressive disorder. The role of depression in suicide has been well studied, including feelings of hopelessness,25 a high comorbidity of anxiety and agitation that escalates the suicide risk,26 and the undertreatment of depression contributing to suicidal behavior. Another important statistic is substance use disorder, which reached 30.5% and was within a previous study range of 19–63%.27 The interaction and comorbidity of mood disorders and substance use disorders should be considered,28 however, for psychiatric comorbidities, there were no significant differences between repeaters and nonrepeaters, although some trends could be observed, including adjustment disorder (repeaters 7.0%, nonrepeaters 18.5%) and alcohol use disorder (repeaters 34.9%, nonrepeaters 22.2%). For the trend observed in regard to adjustment disorder, it can be suggested that nonrepeaters attempted suicide in response to an external stress, while for repeaters, it was more likely to occur in the context of ongoing psychiatric illness. This reiterates the need for person-centred care. That is, if a person presents with a suicide attempt there is a need to ensure that people receive relevant support to deal with adjustment issues and to manage psychiatric illness; as later attempts could reflect that treatment did not adequately address the original co-morbid issues. Regarding alcohol use disorder, repeaters in our study had a prevalence rate (34.9%) that was two-fold of an aforementioned German study,29 which may be race or culture difference, further study may be warranted for explanation.

This study had three limitations in different areas. First, we conducted a retrospective study that relied on medical records for analysis; no structured diagnostic interviews were performed, and the reliability of the information was thus limited. A longitudinal, observational study may be better, since it would provide more reliable information and we could learn more about each case. Furthermore, if we had full accessibility to the National Health Database, we could trace the patients for a longer period of time, since patients in our study were lost to follow-up after discharge, yet they may have used another psychiatric service. Second, this study only focused on the case series of one medical center, which was an inadequate sample size, additionally, the patient was mostly transferred from local clinic or regional hospital, the generalisability was lacking. Third, the follow-up duration should be longer; although 90% of suicide reattempts happen within the first 2 years of follow-up,30 and our mean length of follow-up was 2.73 years, longer follow-up may still obtain more information. Finally, this study is also limited by lacking data for patients without a psychiatric consultation and lacking data between 2016 and 2019.


As suicide repeaters comprised 28.5% of our pesticide cohort patients, early identification of clinical and psychiatric characteristics, including marital status, psychiatric service usage, is emphasized. This helps ensuring that the needs of people who have made a suicide attempt are addressed, it reduces the likelihood of suicide repetition. Further studies are warranted.


The authors report no conflicts of interest in this work.


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