Higher Risk Of Suicide Attempt Research Articles

Association of conventional and electronic cigarette use with suicidality in Chinese adolescents: The moderating effect of sex and school type

BackgroundTo estimate the prevalence of lifetime e-cigarette use and explore the association between lifetime conventional and electronic cigarette use with suicidality among Chinese adolescents, focusing on sex and school-type differences. MethodsA total of 22,509 students from 432 classes in 80 schools were recruited in Guangdong Province using a multistage, stratified cluster, random sampling method in 2021. Self-report questionnaires were used to collect information. Multivariable logistic regression models were performed and stratification analysis was conducted. All analyses were weighted and adjusted for the complex survey design. ResultsThe weighted prevalence of lifetime e-cigarette use among adolescents in Guangdong Province was 8.7 % (4.3 % were dual users and 4.4 % were e-cigarette-only users) and 2.6 % were conventional-cigarette-only users. Lifetime e-cigarette-only users (AOR [Adjusted OR] =1.46, 95 % CI = 1.21–1.76), conventional-cigarette-only users (AOR = 1.97, 95 % CI = 1.58–2.46) and dual users (AOR = 1.67, 95 % CI = 1.38–2.02) were at a higher risk of suicidal ideation than non-users. Lifetime e-cigarette-only users (AOR = 2.03, 95 % CI = 1.53–2.70), conventional-cigarette-only users (AOR = 1.97, 95 % CI = 1.42–2.73), and dual users (AOR = 2.76, 95 % CI = 2.10–3.61) had a significantly higher risk of suicide attempts than non-users. After further analysis stratified by sex and school type, the associations of lifetime cigarette use patterns with suicidality slightly varied. LimitationThe cross-sectional study design and self-report information. ConclusionThe prevalence of e-cigarettes among Chinese adolescents is concerning. Lifetime conventional and e-cigarette use were associated with suicidality among Chinese adolescents, with sex and school type moderating these associations. Targeted measures to restrict cigarette use, including new tobacco product (e-cigarette) use, among adolescents are warranted.

Low-Grade Inflammation Associated with Major Depression Subtypes: A Cross-Sectional Study.

Major depressive disorder (MDD) is associated with inflammation and a high level of comorbidities. Atypical depression (AD) is a MDD subtype based on DSM criteria, that could have specific underlying biological mechanisms. AD is associated with elevated cardiovascular (CVD) comorbidities, higher risk of suicide attempts, hypersomnia, and anxiety disorder. In this study, we aim to investigate if AD and polysomnographic parameters could be associated with low-grade inflammation (LGI). LGI is defined by a range from 3 to 10 mg/L of C-reactive protein levels. We carried out a retrospective cohort study in which 765 individuals with MDD were split into two groups: with and without LGI. Our results exhibit differences between the groups for the polysomnographic parameters, with the LGI group showing parameters already associated with inflammation such as reduced rapid eye movement sleep and elevated hypoxemia markers (identified as CVD risk factor). We found that AD is associated with LGI (OR 1.48; p = 0.047) after adjustment. Likewise, we found an LGI prevalence in AD higher (34.8%) than in MDD without atypical features (26.8%). Overall, these results confirm the low-grade inflammation feature of AD and highlight polysomnographic parameters associated with LGI that could also act as risk factors in this context.

Mental Health of Transgender Youth Following Gender Identity Milestones by Level of Family Support

Transgender youth are at an elevated risk for adverse mental health outcomes compared with their cisgender peers. Identifying opportunities for intervention is a priority. To estimate differences in the association between gender identity milestones and mental health outcomes among transgender youth, stratified by level of family support. This retrospective cohort study compares changes in mental health outcomes among transgender youth who initiate gender identity milestones compared with those who initiate the same milestones 1 year later, stratified by level of family support, using the 2015 US Transgender Survey. The analytic samples included 18 303 transgender adults aged 18 and older who had initiated at least 1 gender identity milestone between ages 4 and 18 years. Four gender identity milestones: feeling one's gender was different, thinking of oneself as transgender, telling another that one is transgender, and living full-time in one's gender identity, stratified by 3 levels of family support: supportive, neutral, and adverse. Age at first suicide attempt and at running away. Study participants included 18 303 transgender adults (10 288 [56.2%] assigned female at birth; 14 777 [80.7%] White). Initiating a gender identity milestone was associated with a higher risk of suicide attempt and running away from home among transgender youth. This finding was driven by children who live in unsupportive families. For example, thinking of oneself as transgender was associated with a meaningful increase in the overall probability of attempting suicide among those in either adverse families (estimate = 1.75 percentage points; 95% CI, 0.47-3.03) or neutral families (estimate = 1.39 percentage points; 95% CI, 0.72-2.05). Among youth living with supportive families, there were no statistically significant associations between gender identity milestones and adverse mental health outcomes and 95% CIs generally ruled out any meaningful associations. These results demonstrate that without a supportive family environment, gender identity development increases the risk of transgender youth attempting suicide or running away from home. Social services and community resources to establish supportive relationships between transgender children and their parents are essential.

Development and validation of a nomogram for suicide attempts in patients with first-episode drug-naïve major depressive disorder.

The risk of suicide can be decreased by accurately identifying high-risk suicide groups and implementing the right interventions. The aim of this study was to develop a nomogram for suicide attempts (SA) in patients with first-episode drug-naïve (FEDN) major depressive disorder (MDD). This study undertook a cross-sectional analysis of 1,718 patients diagnosed with FEDN MDD, providing comprehensive clinical data from September 2016 to December 2018. Data on anthropometric and sociodemographic factors were gathered, and the severity of depression and anxiety was evaluated using the 17-item Hamilton Depression Scale (HAMD-17) and the Hamilton Anxiety Scale (HAMA), respectively. Additionally, thyroid hormone levels, lipid profile parameters, and fasting blood glucose (FBG) were measured. Suicide attempt (SA) history was verified based on an amalgamation of medical records, patient interviews, and family interviews. Participants were randomly divided into a training group (70%, n = 1,204) and a validation group (30%, n = 514). In the training group, LASSO analysis and multivariate regression were used to identify variables associated with SA. A nomogram was then constructed using the identified risk factors to estimate the likelihood of SA within the training group. To assess the accuracy, the area under the receiver operating characteristic curve (AUC) was utilized, and calibration plots were employed to evaluate calibration. Additionally, decision curve analysis (DCA) was performed to assess the precision of the model. Finally, internal validation was carried out using the validation group. A practical nomogram has been successfully constructed, incorporating HAMD, HAMA, thyroid stimulating hormone (TSH), thyroid peroxidase antibody (TPOAb), and systolic blood pressure (SBP) parameters, to estimate the probability of SA in Chinese patients diagnosed with FEDN MDD. The pooled area under the ROC for SA risk in both the training and validation groups was found to be 0.802 (95% CI: 0.771 to 0.832) and 0.821 (95% CI: 0.774 to 0.868), respectively. Calibration analysis revealed a satisfactory correlation between the nomogram probabilities and the actual observed probabilities. The clinical applicability of the nomogram was confirmed through decision curve analysis. To enhance accessibility for clinicians and researchers, an online version of the nomogram can be accessed at https://doctorjunjunliu.shinyapps.io/dynnomapp/. We constructed and validated a nomogram for the early detection of FEDN MDD patients with a high risk of SA, thereby contributing to the implementation of effective suicide prevention programs.

The relationship between borderline personality disorder and self-injurious/suicidal behaviors in adolescents and young adults: A protocol for systematic review and meta-analysis.

Borderline personality disorder (BPD) is a common psychiatric disorder associated with a high risk of suicide attempts, death by suicide, and non-suicidal self-injury (NSSI). A systematic and comprehensive understanding of the link between BPD and suicide and self-injury in adolescents and young adults is crucial for effective public health prevention strategies. This protocol outlines our approach to summarize the evidence on the association between BPD diagnosis and self-injurious/suicidal behaviors including death by suicide, nonfatal suicide attempts, NSSI, and self-harm behavior through a systematic review and meta-analysis. The protocol is registered (PROSPERO: CRD42022363329) and developed in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses Protocols (PRISMA-P)-2015 statement. We will conduct a comprehensive literature search using electronic databases including MEDLINE, EMBASE, SCOPUS, Web of Science, CINHAL, and PsycINFO. The review will include studies that meet the specific inclusion criteria and will be searched using multiple databases A meta-analysis will be conducted using a fixed-effects or random-effects approach based on the level of heterogeneity. Subgroup analysis and meta-regression will be performed if necessary. This study is unique, as it is the first of its kind to systematically review and analyze the existing literature on this topic. The results of this study will provide important evidence on the magnitude of this relationship overall and in different subgroups, which can be used to inform the development of effective prevention and treatment strategies.

Sex differences in correlates of suicide attempts in Chinese Han first‐episode and drug‐naïve major depressive disorder with comorbid subclinical hypothyroidism: A cross‐sectional study

AbstractBackgroundThis study aimed to investigate sex differences in risk factors for suicide attempts in first‐episode and drug naive (FEDN) major depressive disorder (MDD) with comorbid subclinical hypothyroidism (SCH).MethodsA total of 1034 FEDN MDD patients with comorbid SCH were enrolled. The Hamilton Depression Scale (HAMD), Hamilton Anxiety Scale (HAMA), and Positive and Negative Syndrome Scale (PANSS) positive subscale were used to assess patients’ symptoms. Thyroid hormone levels and metabolic parameters were measured.ResultsMDD patients with SCH had a significantly higher risk of suicide attempts than those without SCH (25.4% vs. 12.2%). Logistic regression showed that HAMA score, thyroid stimulating hormone (TSH) levels, and thyroid peroxidase antibody (TPOAb) levels were significantly associated with an increased risk for suicide attempts in both male and female MDD patients comorbid SCH, while low‐density lipoprotein cholesterol (LDL‐C) was significantly associated with an increased risk for suicide attempts only in male patients, HAMD score and systolic blood pressure were significantly associated with an increased risk for suicide attempts only in female patients.ConclusionSCH comorbidities may increase suicide attempts in MDD patients. Our results showed significant sex differences in clinical and metabolic factors associated with suicide attempts among FEDN MDD patients with comorbid SCH, highlighting appropriate sex‐based preventive interventions are needed.

Prevalence and clinical correlates of suicide attempts in patients with first-episode drug-naïve major depressive disorder and comorbid autoimmune thyroiditis.

Autoimmune thyroiditis is closely associated with major depressive disorder (MDD) and suicide attempts. However, few studies have examined this relationship. The study aimed to assess the prevalence and correlates of suicide attempts in patients with first-episode drug-naïve (FEDN) MDD and autoimmune thyroiditis. We recruited 1718 out-patients with FEDN MDD and assessed depressive, anxiety and psychotic symptoms with the Hamilton Rating Scale for Depression, Hamilton Rating Scale for Anxiety (HRSA) and Positive and Negative Syndrome Subscale positive subscale, respectively. The serum levels of free triiodothyronine, free thyroxine, thyroid stimulating hormone (TSH), antithyroglobulin, thyroid peroxidase antibody (TPOAb) and several other metabolic parameters were assessed. Patients were divided into non-autoimmune thyroiditis, autoimmune thyroiditis only and autoimmune thyroiditis with abnormal TSH groups, based on autoimmune thyroiditis severity. Multiple logistic regression model was applied to identify the correlates of suicide attempts in patients with MDD and autoimmune thyroiditis with abnormal TSH. Compared with the non-autoimmune thyroiditis group, the autoimmune thyroiditis with abnormal TSH group had a nearly fourfold higher likelihood of reporting a suicide attempt, whereas no difference was found between the non-autoimmune thyroiditis and autoimmune thyroiditis only groups. HRSA score, lnTPOAb and lnTSH were independently associated with suicide attempts in patients with autoimmune thyroiditis with abnormal TSH. Patients with MDD and autoimmune thyroiditis with abnormal TSH are at higher risk for suicide attempt. TPOAb, TSH and anxiety are all independently associated with suicide attempts in this population, and regular thyroid checks are warranted.

Characterization of suicidal behavior in Coquimbo, Chile, between 2018 and 2020.

Suicidal behavior is a public health problem worldwide. The World Health Organization estimated 700 000 deaths for the year 2021. This study aimed to estimate the prevalence of suicidal behavior and describe its related factors in the Coquimbo Region, Chile, between 2018 and 2020. 2190 suicide attempt notifications from the regional epidemiological surveillance system were analyzed, corresponding to 1781 people, along with 217 reports from the Forensic Medical Service of people who died by suicide. The overall suicide rate for the region during that period was 9.79 deaths per 100 000 inhabitants. The 2018 rates were standardized according to available information, with direct methods for the regional rate (9.55 per 100 000 inhabitants) and indirect methods for the communes. Rural communes presented higher rates than urban ones. Women showed a higher risk of attempts (OR 1.28; 95% CI 1.23 to 1.33) and a lower risk of suicide compared to men (0.086; 0.06 to 0.13). Young people had a higher risk of suicide attempts and a lower risk of suicide compared to older people. The increased suicide rates in older people (70 to 79 years) during 2020 are noteworthy. Basic education level is a risk variable for suicide (2.21; from 1.15 to 4.23), compared to having higher education. Previous suicide attempts and psychiatric pathology are risk factors. Suicide prevalence and related factors are similar to those reported in other studies and national reports, highlighting rurality and higher risk in older male adults. In contrast to suicides, attempts are more frequent in women and young people. A history of mental health problems, previous attempts, and family violence are risk factors for both outcomes. Knowing the patterns of suicidal behavior in the population is fundamental for its prevention.

Outcomes for university students following emergency care presentation for deliberate self-harm: a retrospective observational study of emergency departments in England for 2017/2018

ObjectivesIdentify university-aged students and contrast their healthcare provision and outcomes with other patients in the same age group attending emergency departments for deliberate self-harm.DesignRetrospective cross-sectional observational study.SettingPatients visiting 129 public...

Understanding the educational inequalities in suicide attempts and their mediators: a Mendelian randomisation study

BackgroundEducational inequalities in suicide have become increasingly prominent over the past decade. Elucidating modifiable risk factors that serve as intermediaries in the impact of low educational attainment on suicide has...

Same sex-attraction as a predictor of suicide and self-harm behaviours: The role of bullying and social support

Sexual minority youth are at higher risk of self-harming than heterosexual adolescents. Understanding why sexual minority youth are more vulnerable to poor mental health and identifying factors that might buffer against this risk is important for developing targeted interventions.We used the Millennium Cohort Study to investigate whether same-sex attraction at age 14 is associated with suicide attempts and self-harm at age 17. Additionally, we tested whether bullying victimisation might mediate any observed associations, and whether social support might protect against any increased risk.Sexual minority youth were 2.44 times more likely to attempt suicide and 2.59 times more likely to self-harm aged 17. There was no evidence for an association between greater social support and lower levels of self-harm. However, greater social support in sexual minority youth is associated with reduced risk for suicide attempt. Bullying partially mediated the relationship between same-sex attraction and mental health. Greater levels in bullying in sexual minority youth were associated with 1.32 times higher risk for suicide and 1.30 times higher risk for self-harm. Social support was not associated with reduced risk of suicide attempt or self-harm among bullied sexual minority youth.Sexual minority youth in the UK are at higher risk for suicide attempt and self-harm. To address this disparity, health and educational practitioners should understand this heightened risk for poor mental health, and address bullying as one risk factor. Further interventions are needed to assist sexual minority youth beyond social support provision through friends and family.

The influence of childhood trauma and chronotype on suicide attempts in Chinese emerging adults with severe depressive symptoms

BackgroundStudies have investigated how adults with severe depressive symptoms are more likely to attempt suicide, and these adults often have traumatic experiences and chaotic sleep/wake rhythms. Thus, this study using Latent class analysis aimed to investigate the relationship between childhood trauma class, chronotype, and suicide attempts among emerging adults with severe depressive symptoms.MethodsThis study was conducted among emerging adults with severe depressive symptoms covering 63 Universities in Jilin Province, China. A total of 1,225 emerging adults (mean age = 19.6 ± 1.78) constructed the final sample. In addition to measuring socio-demographic characteristics, the Childhood Trauma Questionnaire-Short Form, the Single-Item Chronotyping, and a single item for suicide attempts were used to evaluate childhood trauma, chronotype, and suicide attempts, respectively. Latent class analysis was applied to identify the classes of childhood trauma within emerging adults who had severe depressive symptoms. Hierarchical logistic regression models were run to investigate the effects of socio-demographic characteristics, chronotype, and childhood trauma class on suicide attempts.ResultsThree latent classes were identified: the Low-risk for childhood trauma class, the Neglect class, and the High-risk for childhood abuse class. Those who suffered sexual, emotional, and physical abuse at the same time were divided into the High-risk for childhood abuse class, and were significantly more likely to experience suicide attempts than those in the Neglect class (OR = 1.97, 95%CI = 1.34–2.89, p < 0.001) and the Low-risk for childhood trauma class (OR = 2.28, 95% CI = 1.50-3.46, p < 0.001). In terms of chronotype, the results showed that the chaotic type was a risk factor for suicide attempts when compared with the evening type (OR = 0.46, 95%CI = 0.27–0.78, p < 0.01), the moderately active type (OR = 0.53, 95%CI = 0.31–0.89, p < 0.05), and the daytime type (OR = 0.42, 95%CI = 0.21–0.86, p < 0.05). Overall, the significant risk factors for suicide attempts included being female, living in an urban area, having experienced sexual, emotional, and physical abuse simultaneously, and having a chaotic chronotype.ConclusionEmerging adults suffering sexual, emotional, and physical abuse at the same time and identifying with chaotic chronotype showed a higher risk of attempting suicide. The findings provided a clinical reference to quickly identify those at high risk of suicide attempts among emerging adults with severe depressive symptoms.

The effect of common mental disorders on suicidal attempts by women, during pregnancy and six to nine years after birth.

There is scarcity of global data on suicide attempts (SA). The higher frequency of mental disorders places women at a higher risk for SA. Mental disorders (MD) are ranked first in the Global Burden of Diseases (GBD) in terms of years lived with disability (YLD) and common mental disorders (CMD) affect women the most. IN this light, the present study aimed to investigate the impact of CMD during pregnancy, as well as 6 to 9 years after birth, on SA in women who were registered in the Family Health Strategy from the town of Recife, Pernambuco, Brazil. This study consisted of two stages of a prospective cohort. 643 adult women were included. The prevalence of CMD in stage I (pregnancy) and in stage III (six to nine years after birth) were, respectively, 19.3% and 12.6%. The incidence of SA was 10.9%. The multivariate analysis demonstrated a cumulative effect of CMD for SA: only during pregnancy (OR 5.4; 95%CI 2.2-13.3); only in the third stage (OR 5.8; 95%CI 2.3-14.9); and in both stages (OR 6.0; 95%CI 2.5-14.4). The increase of CMD in women increases the chances of SA, hence the importance of implementing public policies for women's health, especially for those with a history of mental disorders and unhealthy habits, and those who suffer violence.

Efeito dos transtornos mentais comuns na gestação e seis a nove anos pós-parto para a tentativa de suicídio em mulheres

Abstract There is scarcity of global data on suicide attempts (SA). The higher frequency of mental disorders places women at a higher risk for SA. Mental disorders (MD) are ranked first in the Global Burden of Diseases (GBD) in terms of years lived with disability (YLD) and common mental disorders (CMD) affect women the most. IN this light, the present study aimed to investigate the impact of CMD during pregnancy, as well as 6 to 9 years after birth, on SA in women who were registered in the Family Health Strategy from the town of Recife, Pernambuco, Brazil. This study consisted of two stages of a prospective cohort. 643 adult women were included. The prevalence of CMD in stage I (pregnancy) and in stage III (six to nine years after birth) were, respectively, 19.3% and 12.6%. The incidence of SA was 10.9%. The multivariate analysis demonstrated a cumulative effect of CMD for SA: only during pregnancy (OR 5.4; 95%CI 2.2-13.3); only in the third stage (OR 5.8; 95%CI 2.3-14.9); and in both stages (OR 6.0; 95%CI 2.5-14.4). The increase of CMD in women increases the chances of SA, hence the importance of implementing public policies for women’s health, especially for those with a history of mental disorders and unhealthy habits, and those who suffer violence.

Divorce and risk of suicide attempt: a Swedish national study.

Prior research has reported an association between divorce and suicide attempt. We aimed to clarify this complex relationship, considering sex differences, temporal factors, and underlying etiologic pathways. We used Swedish longitudinal national registry data for a cohort born 1960-1990 that was registered as married between 1978 and 2018 (N = 1 601 075). We used Cox proportional hazards models to estimate the association between divorce and suicide attempt. To assess whether observed associations were attributable to familial confounders or potentially causal in nature, we conducted co-relative analyses. In the overall sample and in sex-stratified analyses, divorce was associated with increased risk of suicide attempt (adjusted hazard ratios [HRs] 1.66-1.77). Risk was highest in the year immediately following divorce (HRs 2.20-2.91) and declined thereafter, but remained elevated 5 or more years later (HRs 1.41-1.51). Divorcees from shorter marriages were at higher risk for suicide attempt than those from longer marriages (HRs 3.33-3.40 and 1.20-1.36, respectively). In general, HRs were higher for divorced females than for divorced males. Co-relative analyses suggested that familial confounders and a causal pathway contribute to the observed associations. The association between divorce and risk of suicide attempt is complex, varying as a function of sex and time-related variables. Given evidence that the observed association is due in part to a causal pathway from divorce to suicide attempt, intervention or prevention efforts, such as behavioral therapy, could be most effective early in the divorce process, and in particular among females and those whose marriages were of short duration.

Functions of nonsuicidal self-injurious behavior in Russian patients with suicidal ideation.

Nonsuicidal self-injurious behavior (NSSI) is an important risk factor for future suicide attempts. Previous research has identified a number of motivations for engaging in NSSI. The aim of the present study was to translate the Inventory of Statements About Self-Injury (ISAS) into Russian and then to evaluate its psychometric properties in a sample of patients with non-psychotic mental disorders and suicidal ideation (SI). Other aims were to determine the prevalence of specific NSSI functions in this population and to assess the relationship between different NSSI functions and clinical and psychological parameters. The study was conducted at the largest center for non-psychotic mental disorders in Moscow. All admitted patients with both NSSI and SI completed the Russian version of the ISAS-II, underwent the Self-Injurious Thoughts and Behaviors Interview, and completed the Personality Inventory for DSM-5 and ICD-11 Brief Form Plus-Modified, the Beck Depression Inventory, and the State-Trait Anxiety Inventory. A total of 614 patients were included in the study. 543 (88.4%) patients were assigned female at birth with a mean age of 24.86 (7.86) years. Factor analysis supported a two-factor structure (Intrapersonal and Interpersonal) of the Russian version of the ISAS-II, but in contrast to the original study, the "Marking distress" function loaded more strongly on the Interpersonal factor. In people with non-psychotic mental disorders and SI, Interpersonal functions of NSSI are associated with more severe depressive symptoms (r = 0.34), 12 months history of NSSI (r = 0.30), higher number of NSSI methods (r = 0.41), likelihood of future NSSI (r = 0.35) and psychoticism (r = 0.32). The Russian version of the ISAS-II is a valid and reliable instrument for assessing NSSI functions in a population at high risk for suicide attempts. Interpersonal functions are associated with a number of unpleasant clinical and psychological features.

A Systematic Review of MRI Studies and the "Emotional paiN and social Disconnect (END)" Brain Model of Suicidal Behavior in Youth.

Risk of suicidal ideation and suicidal behaviors greatly increases during adolescence, and rates have risen dramatically over the past two decades. However, few risk factors or biomarkers predictive of suicidal ideation or attempted suicide have been identified in adolescents. Neuroimaging correlates hold potential for early identification of adolescents at increased risk of suicidality and risk stratification for those at high risk of suicide attempt. In this systematic review, we evaluated neural regions and networks associated with suicidal ideation and suicide attempt in adolescents derived from magnetic resonance imaging (MRI) studies. A total of 28 articles were included in this review. After descriptively synthesizing the literature, we propose the Emotional paiN and social Disconnect (END) model of adolescent suicidality and present two key neural circuits: (1) the emotional/mental pain circuit and (2) the social disconnect/distortion circuit. In the END model, the emotional pain circuit-consisting of the cerebellum, amygdala, and hippocampus-shows similar aberrations in adolescents with suicidal ideation as in those with a history of a suicide attempt (but to a smaller degree). The social disconnect circuit is unique to adolescent suicide attempters and includes the lateral orbitofrontal cortex (OFC), the temporal gyri, and the connections between them. Our proposed END brain model of suicidal behavior in youth, if confirmed by future prospective studies, can have implications for clinical goals of early detection, risk stratification, and intervention development. Treatments that target emotional pain and social disconnect may be ideal interventions for reducing suicidality in adolescents.

Are false positives in suicide classification models a risk group? Evidence for "true alarms" in a population-representative longitudinal study of Norwegian adolescents.

False positives in retrospective binary suicide attempt classification models are commonly attributed to sheer classification error. However, when machine learning suicide attempt classification models are trained with a multitude of psycho-socio-environmental factors and achieve high accuracy in suicide risk assessment, false positives may turn out to be at high risk of developing suicidal behavior or attempting suicide in the future. Thus, they may be better viewed as "true alarms," relevant for a suicide prevention program. In this study, using large population-based longitudinal dataset, we examine three hypotheses: (1) false positives, compared to the true negatives, are at higher risk of suicide attempt in future, (2) the suicide attempts risk for the false positives increase as a function of increase in specificity threshold; and (3) as specificity increases, the severity of risk factors between false positives and true positives becomes more similar. Utilizing the Gradient Boosting algorithm, we used a sample of 11,369 Norwegian adolescents, assessed at two timepoints (1992 and 1994), to classify suicide attempters at the first time point. We then assessed the relative risk of suicide attempt at the second time point for false positives in comparison to true negatives, and in relation to the level of specificity. We found that false positives were at significantly higher risk of attempting suicide compared to true negatives. When selecting a higher classification risk threshold by gradually increasing the specificity cutoff from 60% to 97.5%, the relative suicide attempt risk of the false positive group increased, ranging from minimum of 2.96 to 7.22 times. As the risk threshold increased, the severity of various mental health indicators became significantly more comparable between false positives and true positives. We argue that the performance evaluation of machine learning suicide classification models should take the clinical relevance into account, rather than focusing solely on classification error metrics. As shown here, the so-called false positives represent a truly at-risk group that should be included in suicide prevention programs. Hence, these findings should be taken into consideration when interpreting machine learning suicide classification models as well as planning future suicide prevention interventions for adolescents.

Potential Inflammatory Biomarkers for Major Depressive Disorder Related to Suicidal Behaviors: A Systematic Review.

Major depressive disorder (MDD) is a highly prevalent psychiatric condition affecting an estimated 280 million individuals globally. Despite the occurrence of suicidal behaviors across various psychiatric conditions, MDD is distinctly associated with the highest risk of suicide attempts and death within this population. In this study, we focused on MDD to identify potential inflammatory biomarkers associated with suicidal risk, given the relationship between depressive states and suicidal ideation. Articles published before June 2023 were searched in PubMed, Embase, Web of Science, and the Cochrane Library to identify all relevant studies reporting blood inflammatory biomarkers in patients with MDD with suicide-related behaviors. Of 571 articles, 24 were included in this study. Overall, 43 significant biomarkers associated with MDD and suicide-related behaviors were identified. Our study provided compelling evidence of significant alterations in peripheral inflammatory factors in MDD patients with suicide-related behaviors, demonstrating the potential roles of interleukin (IL)-1β, IL-6, C-reactive protein, C-C motif chemokine ligand 2, and tumor necrosis factor-α as biomarkers. These findings underscore the intricate relationship between the inflammatory processes of these biomarkers and their interactions in MDD with suicidal risk.

Multiple Sclerosis and Suicide Attempts: A Review including a Meta-Analysis of Prevalence

Background. Multiple sclerosis is an autoimmune inflammatory demyelinating disorder, and persons diagnosed with multiple sclerosis have a shorter life expectancy than the general population. Recent meta-analyses have examined the association between MS and suicide and between MS and suicidal ideation. The objective of the present review was to examine if MS is associated with a higher risk of suicide attempt. We hypothesised that MS patients were at increased risk of suicide attempts. Methods. Four databases (PubMed including MEDLINE, EMBASE, Web of Science, and PsycINFO) were searched systematically for studies assessing the risk of attempted suicide in people with MS. Eligibility criteria were studies designed as cohort, case-control, or cross-sectional studies with attempted suicide as the outcome and published in English. Lifetime prevalence of suicide attempt was calculated through a meta-analysis, and the results were presented as a forest plot. Sensitivity analyses were used to investigate the heterogeneity among studies. Results. 13 studies were identified from 533 records, providing a total population of 50,004 participants of whom 599 had attempted suicide. The weighted overall prevalence of suicide attempts among people with MS was 0.04 (95% CI 0.02-0.06) with a Cochran’s Q value of 591.05, which rejected the null hypothesis of homogeneous studies. The performed sensitivity analysis resulted in an I 2 of 81% as the lowest possible value, which still indicated a high level of heterogeneity. Conclusion. To our knowledge, this is the first study to examine the association between MS and suicide attempts in a meta-analysis. The results suggest a significant association between MS and suicide attempts. However, the small number of the included studies and the heterogeneous nature of these studies indicate a need for more studies based on more homogeneous samples.