Sex-specific impact of socio-economic factors on suicide risk: a population-based case-control study in Denmark

Risk of Depression according to Cumulative Exposure to a Low-Household Income Status in Individuals with Type 2 Diabetes Mellitus: A Nationwide Population- Based Study

BACKGRUOUND

We aimed to identify the risk of incident depression according to cumulative exposure to a low-household income status in individuals with type 2 diabetes mellitus (T2DM).

METHODS

For this retrospective longitudinal population-based cohort study, we used Korean National Health Insurance Service data from 2002 to 2018. Risk of depression was assessed according to cumulative exposure to low-household income status (defined as Medical Aid registration) during the previous 5 years among adults (aged ≥20 years) with T2DM and without baseline depression who underwent health examinations from 2009 to 2012 (n=2,027,317).

RESULTS

During an average 6.23 years of follow-up, 401,175 incident depression cases occurred. Advance in cumulative number of years registered for medical aid during the previous 5 years from baseline was associated with an increased risk of depression in a dose-dependent manner (hazard ratio [HR], 1.44 [95% confidence interval (CI), 1.38 to 1.50]; HR, 1.40 [95% CI, 1.35 to 1.46]; HR, 1.42, [95% CI, 1.37 to 1.48]; HR, 1.46, [95% CI, 1.40 to 1.53]; HR, 1.69, [95% CI, 1.63 to 1.74] in groups with 1 to 5 exposed years, respectively). Insulin users exposed for 5 years to a low-household income state had the highest risk of depression among groups categorized by insulin use and duration of low-household income status.

CONCLUSION

Cumulative duration of low-household income status, defined as medical aid registration, was associated with an increased risk of depression in a dose-response manner in individuals with T2DM.

The complexities of suicide: a multilevel survival analysis examining individual, familial and neighbourhood determinants of suicide risk using Danish register-based data

BACKGROUND

Suicide risk is complex and nuanced, and how place impacts suicide risk when considered alongside detailed individual risk factors remains uncertain. We aimed to examine suicide risk in Denmark with both individual and neighbourhood level risk factors.

METHODS

We used Danish register-based data to identify individuals born in Denmark from 1972, with full parental information and psychiatric diagnosis history. We fitted a two-level survival model to estimate individual and neighbourhood determinants on suicide risk.

RESULTS

We identified 1723 cases of suicide in Denmark during the follow-up period from 1982 to 2015. Suicide risk was explained mainly by individual determinants. Parental comorbidities, particularly maternal schizophrenia [incidence rate ratio (IRR): 2.29, 95% CI 1.56-3.16] and paternal death (2.29, 95% CI 1.31-3.72) partly explained suicide risk when adjusted for all other determinants. The general contextual effect of suicide risk across neighbourhoods showed a median incidence rate ratio (MRR) of 1.13 (1.01-1.28), which was further reduced with full adjustment. Suicide risk increased in neighbourhoods with a higher proportion of manual workers (IRR: 1.08; 1.03-1.14), and decreased with a higher population density (IRR: 0.89; 0.83-0.96).

CONCLUSION

Suicide risk varies mainly between individuals, with parental comorbidities having the largest effect on suicide risk. Suicide risk was less impacted by neighbourhood, though, albeit to a lesser extent than individual determinants, some characteristics were associated with suicide risk. Suicide prevention policies might consider targeting interventions towards individuals more vulnerable due to particular parental comorbidities, whilst taking into account that some neighbourhood characteristics might exacerbate this risk further.

A network approach to understand co-occurrence and relative importance of different reasons for suicide: a territory-wide study using 2002-2019 Hong Kong Coroner's Court reports

Background

Suicide is a complex and multifaceted issue, and suicidal behaviors are often driven by multiple, interacting factors. It has been challenging to identify reasons for suicide using existing scientific methodologies. This study aims to identify critical reasons for suicide and suicidal behaviors through the application of novel network science methods.

Methods

Based on cases investigated by the Hong Kong Coroner's Court from 2002 to 2019, we modelled identified reasons for 13,001 suicide cases as a co-occurrence network, and calculated each reason's eigencentrality to determine their respective relative importance. We then analyzed the temporal and demographic changes in the structure and eigencentrality of the network. We further conducted simulation studies based on the United Nations population projection to assess potential burden of different reasons for suicide on the population in the coming years.

Findings

School-related issues had the highest eigencentrality (eigencentrality = 0.49) for individuals younger than 20 years of age. Financial issues were crucial for adults aged 20-59 years, but their importance differed between males (eigencentrality = 0.51) and females (eigencentrality = 0.14). Physical illness (eigencentrality = 0.80) was the core concern for adults over 60 years. Across the Hong Kong population, the reasons for suicide appear to have shifted from financial issues in the early 2000s (eigencentrality = 0.46) to issues related to physical illnesses since 2011 (eigencentrality = 0.58). Simulation findings indicate that, by 2050, most suicides in Hong Kong will be due to physical illness-related issues (eigencentrality = 0.69) due to the rapidly aging population.

Interpretation

There have been important sex and age differences over time, in reasons for suicide. Given the projected increasing age of the Hong Kong population over the next decades, older adults with physical illnesses appear to be the highest contributors to suicide cases in the overall population. This novel network analysis approach provides important data-driven information upon which to base effective proactive public health suicide prevention strategies and interventions.

Funding

Hong Kong Jockey Club Charities Trust, Collaborative Research Fund (C7151-20G), and General Research Fund (17606521).

Single and combined effects of marital status, education attainment, and employment status on suicide among working-age population: A case-control study in South Korea

Background

Suicide in the working-age population is an important public health issue. This group is heterogeneous regarding marital status, education level, and employment status, which are generally important socioeconomic factors for suicide, and has a wide age range. This study aims to explore the individual and combined effect of these socioeconomic factors on suicide in different age groups among the working-age population.

Methods

This study utilized a population-based case-control design for the working-age population in South Korea. Suicide cases were identified in Korean Governmental Death Registry from 2008 to 2017, and eight controls from Korea Community Health Survey were matched to each case by gender, age group, and year of suicide. Conditional logistic regression models estimated the relationship between marital status and socioeconomic status (SES) including educational attainment and employment status and suicide and examined the combined effect of the SES indicators and marital status on suicide.

Results

Low education, single status, and unemployment or economically inactive status were associated with suicide, but their magnitude varied across SES indicators. The association between SES and suicide was more pronounced in younger adults. The suicide risk was highest among divorced women aged 25–34 years (OR = 7.93; 95% CI: 7.21–8.72). Individuals experiencing two social adversities among SES or marital status had a significantly increased suicide risk. Those who are divorced and unemployed or economically inactive have the highest suicide risk, specifically among men aged 24–35 years (OR = 17.53; 95% CI: 14.96–20.55).

Conclusions

Marital status, education attainment, and employment status have a separate and combined impact on suicide among the working-age population. Specifically, the divorced and unemployed or economically inactive status amplified suicide risk, predominantly among young adults. Monitoring and intervention for those young adults should be considered for suicide prevention.

•

Using a case-control design, we were able to demonstrate single as well as the combined impact of socioeconomic status on suicide.

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Poor SES was associated with suicide, but its magnitude varied across SES indicators. The suicide risk was highest among divorced adults.

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Individuals with two different types of poor SES and single status had an increased suicide risk. Specifically, those who are divorced and unemployed or economically inactive have the highest suicide risk.

•

The pattern of the association between socioeconomic status and suicide was dependent on age. The association between SES and marital status and suicide was more pronounced in younger adults.

Suicide mortality among the elderly population in Italy: A nationwide cohort study on gender differences in sociodemographic risk factors, method of suicide, and associated comorbidity

OBJECTIVES

This study aimed at investigating gender differences in the relationship between sociodemographic factors and suicide mortality, as well as in the method used for suicide and the presence of comorbidities in an older population in Italy.

METHODS/DESIGN

We conducted a historical cohort study based on individual record linkage across the 15th Italian Population Census, the Italian Population Register, and the National Register of Causes of Death. Suicides among people aged 75 years or older from 2012 to 2017 were analyzed. Crude mortality rates were computed, and cause-specific mortality rate ratios were estimated using negative binomial regression models. Chi-square tests were used to evaluate significant gender differences in suicide methods and comorbidities associated with suicide.

RESULTS

The study included 9,686,698 individuals (41% men, 59% women). Compared to living alone, living with children or partners reduced suicide mortality, especially among men. Having high or medium educational levels was associated with lower mortality than low educational levels among men. Foreign citizens had lower mortality among men, but not among women. Living in urban areas was associated with lower suicide rates in men and higher rates in women. Methods of suicide significantly differed by gender: leading methods were hanging, strangulation, and suffocation in men, and falling from height in women. Mental comorbidity was significantly more frequent among women, especially at ages 75-84 years.

CONCLUSIONS

We believe that our findings might help to promote public health strategies taking gender differences in old age into account to improve social support and quality of life of older men and women.

Parenthood and lower risk of suicide in women and men: the total Swedish population followed across adulthood

BACKGROUND

Previous studies suggest a protective effect of parenthood on suicide, but little is known about how the association may change across the lifespan, or in relation to sex, marital status or occurrence of psychiatric disorders.

METHODS

We followed a cohort of over 5 million Swedish women and men, from 1991 to 2011, up to max. age 75, for death by suicide using national registers. Information on childbirths/adoptions, potential confounders and modifying factors were obtained from national registers. We assessed the associations between parenthood and suicide across adulthood using within time-stratified Cox regression models, with parenthood as a time-dependent exposure.

RESULTS

Parents had a lower risk of suicide than non-parents across the lifespan, after adjusting for sociodemographic factors. The association was most pronounced in young adults, especially young women, but attenuated with increasing age and converged between sexes in older age groups. The lower risk of suicide over the life course was similar whether parents were married, unmarried or divorced, apart from married men; among them, parents only had a lower risk above age 55. The lower risk in parents was also evident in people with a history of psychiatric hospitalizations, but disappeared from age 55 in this population.

CONCLUSION

The lower risk of suicide was present in both parents, was most pronounced in young adulthood and weakened with increasing age. Our results are consistent with a plausible mechanism where feelings of responsibility and connectedness are protective against suicide in parents.

Contributing factors to suicide: Political, social, cultural and economic

This review summarizes recent research in four environmental areas affecting risk of deaths by suicide. Politically, the weight of the evidence suggests that laws increasing social welfare expenditures and other policies assisting persons with low incomes (e.g., minimum wage) tend to lower suicide rates. Other legal changes such as those restricting firearms and alcohol availability can also prevent suicides. The social institutions of marriage, as well as parenting, continue to serve as protective factors against suicide, although the degree of protection is often gendered. Religiousness tends to be inversely associated with suicide deaths at the individual level of analysis, but the mediators need exploration to determine what accounts for the association: social support, better mental health, better physical health, less divorce, or other covariates. Cultural definitions of the traditional male role (e.g., breadwinner culture) continue to help explain the high male to female suicide ratio. New work on the "culture of suicide" shows promise. The degree of approval of suicide is sometimes the single most important factor in predicting suicide. At the individual level of analysis, two of the strongest predictors of suicide are economic ones: unemployment and low socio-economic status. Attention is drawn to enhancing the minimum wage as a policy known to lower state suicide rates. Limitations of research include model mis-specification, conflicting results especially when ecological data are employed, and a need for more research exploring moderators of established patterns such as that between religiousness and suicide.

Material hardship and suicidal behavior: Associations among parents and non-parents

INTRODUCTION

Material hardship is unique facet of economic distress and may be a risk factor for suicidal behavior. Parents are more likely to experience both material hardship and suicidal behavior than non-parents. The aims of this study were to (a) examine the association of material hardship with suicidal behavior and (b) assess whether associations differed for parents and non-parents.

METHODS

We used data from Waves IV and V of the National Longitudinal Study of Adolescent to Adult Health (N = 10,685). We conducted logistic regression to examine the association of one and two or more material hardships at Wave IV with suicidal behavior at Wave V.

RESULTS

Overall, 38.8% of participants reported material hardship at Wave IV and 7.5% reported suicidal ideation or attempts at Wave V. In the total sample, one material hardship (OR = 1.57, 95% CI 1.20, 2.06) and two or more material hardships (OR = 1.52, 95% CI 1.04, 2.21) were associated with an increased likelihood of suicidal behavior. Among parents, two or more material hardships (OR = 1.86, 95% CI 1.17, 2.94) were associated with an increased likelihood of suicidal behavior. Among non-parents, one material hardship (OR = 1.81, 95% CI 1.26, 2.59) was associated with an increased likelihood of suicidal behavior.

CONCLUSIONS

Programs and policies aimed at addressing material hardship, particularly accumulating material hardships among parents, may be an effective suicide prevention strategy.

Marital status, educational attainment, and suicide risk: a Norwegian register-based population study

Background

The presence and quality of social ties can influence suicide risk. In adulthood, the most common provider of such ties is one’s partner. As such, the link between marital status and suicide is well-documented, with lower suicide risk among married. However, the association between marital status and educational level suggest that marriage is becoming a privilege of the better educated. The relationship between educational attainment and suicide is somewhat ambiguous, although several studies argue that there is higher suicide risk among the less educated. This means that unmarried with low education may concurrently experience several risk factors for suicide. However, in many cases, these associations apply to men only, making it unclear whether they also refer to women. We aim to investigate the association between marital status, educational attainment, and suicide risk, and whether these associations differ across sexes.

Methods

Our data consist of Norwegian residents aged 35–54, between 1975 and 2014. Using personal identification-numbers, we linked information from various registers, and applied event history analysis to estimate suicide risk, and predicted probabilities for comparisons across sexes.

Results

Overall, associations across sexes are quite similar, thus contradicting several previous studies. Married men and women have lower suicide risk than unmarried, and divorced and separated have significant higher odds of suicide than never married, regardless of sex. Low educational attainment inflates the risk for both sexes, but high educational attainment is only associated with lower risk among men. Being a parent is associated with lower suicide risk for both sexes.

Conclusions

Higher suicide risk among the divorced and separated points to suicide risk being associated with ceasing of social ties. This is the case for both sexes, and especially those with low educational attainment, which both healthcare professionals and people in general should be aware of in order to promote suicide prevention.

Gendered experiences of unemployment, suicide and self-harm: a population-level record linkage study

BACKGROUND

Unemployment and being not in the labour force (NILF) are risk factors for suicide, but their association with self-harm is unclear, and there is continuing debate about the role of confounding by prior mental health conditions. We examine associations between employment status and self-harm and suicide in a prospective cohort, taking into account prior mental-health-related factors.

METHODS

We used linked data from the New Zealand Integrated Data Infrastructure. The outcomes were chosen to be hospital presentation for self-harm and death by suicide. The exposure was employment status, defined as employed, unemployed, or NILF, measured at the 2013 Census. Confounders included demographic factors and mental health history (use of antidepressant medication, use of mental health services, and prior self-harm). Logistic regression was used to model effects. Analyses were stratified by gender.

RESULTS

For males, unemployment was associated with an increased risk of suicide [odds ratio (OR): 1.48, 95% confidence interval (CI): 1.20-1.84] and self-harm (OR: 1.55, 95% CI: 1.45-1.68) after full adjustment for confounders. NILF was associated with an increased risk of self-harm (OR: 1.43, 95% CI: 1.32-1.55), but less of an association was seen with suicide (OR: 1.19, 95% CI: 0.94-1.49). For females, unemployment was associated with an increased risk of suicide (OR: 1.30, 95% CI: 0.93-1.80) and of self-harm (OR: 1.52, 95% CI: 1.43-1.62), and NILF was associated with a similar increase in risk for suicide (OR: 1.31, 95% CI: 0.98-1.75) and self-harm (OR: 1.32, 95% CI: 1.26-1.40).

DISCUSSION

Exclusion from employment is associated with a considerably heightened risk of suicide and self-harm for both men and women, even among those without prior mental health problems.

A systematic review of suicidal behaviour in men: A narrative synthesis of risk factors

RATIONALE

Suicides by men outnumber those by women in every country of the world. To date, there has not been a comprehensive systematic review of risk factors for suicidal behaviour in men to better understand the excess deaths by suicide in men.

OBJECTIVE

The present systematic review seeks to determine the nature and extent of the risk factors to predict suicidal behaviour in men over time.

METHODS

A range of databases (CINAHL, PsycINFO, Web of Science Core Collection, Pubmed, Embase, and Psychology and Behavioural Sciences Collection) were searched from inception to January 2020 for eligible articles. The findings were collated through a narrative synthesis of the evidence.

RESULTS

An initial 601 studies were identified. Following the inclusion and exclusion criteria, there were 105 eligible studies (62 prospective and 43 retrospective) identified. Overall, the risk factors with the strongest evidence predicting suicidal behaviour in men were alcohol and/or drug use/dependence; being unmarried, single, divorced, or widowed; and having a diagnosis of depression. In the prospective studies, the most consistent evidence was for sociodemographic factors (19 risk factors), mental health/psychiatric illness (16 risk factors), physical health/illness (13 risk factors), and negative life events/trauma (11 risk factors). There were a small number of psychological factors (6 factors) and characteristics of suicidal behaviour (3 factors) identified. The findings from the retrospective studies provided further evidence for the risk factors identified in the prospective studies.

CONCLUSIONS

This systematic review has highlighted the wide range of risk factors for suicidal behaviour in men, in this review alone 68 different risk factors were identified. Many factors can interact and change in relevance throughout an individual's life. This review has identified extensive gaps in our knowledge as well as suggestions for future research.

Parenthood is associated with lower suicide risk: a register-based cohort study of 1.5 million Swedes

OBJECTIVE

To determine whether parenthood among 25- to 44-year-olds is associated with a lower suicide rate in men and women in Sweden, and whether this is explained by selection into parenthood.

METHODS

In total, 1,582,360 Swedish women and men, born between 1967 and 1985, and childless at their 25^th birthday, were followed from 1992 to 2011. All data originated from linkage to national Swedish registers. Cox regression models were used with time-varying parenthood status to estimate adjusted hazard ratios and 95% confidence intervals (aHR;CI) for suicide.

RESULTS

Having one, two, three or more children was associated with 64%, 79% and 78% lower suicide rate, respectively, compared with having no children, in models with basic adjustments. When a wide range of indicators of selection into parenthood were taken into account, the suicide rate was 58% lower in parents with one child and 70% lower in parents with two or more children compared with childless individuals (aHR 0.42 [95% CI 0.36-0.48]; 0.30 [95% CI 0.25-0.35]; 0.30 [95% CI 0.21-0.42]). In fathers with one, two, three or more children suicide rate was 54%, 64% and 59% lower, respectively, compared with non-fathers whereas in mothers was 70%, 83% and 93% lower, respectively, compared with non-mothers.

CONCLUSION

Parenthood among 25-to 44-year-olds is associated with a lower suicide risk in both men and women but to a larger extent among women, and particularly in parents with two or more children. Although selection into parenthood is possible, a protective effect of parenthood on suicide is likely in both men and women.

Deliberate self-harm and associated risk factors in young adults: the importance of education attainment and sick leave

PURPOSE

The prevalence of deliberate self-harm (DSH) is high in young adults. However, few studies have examined risk in this specific age group. We, therefore, examined the relative influence and interactive nature of a wide range of potential sociodemographic and sick leave related risk factors in young adults, aged 18-35 years, using Norwegian register data.

METHODS

All subjects with at least one episode of hospital presentation for DSH registered in the Norwegian Patient Register during the period 2008-2013 were compared with age, gender and date matched population controls using a nested case-control design. The relative influence of factors and their interactions were assessed using conditional logistic regression and recursive partitioning models.

RESULTS

9 873 study cases were compared to 186 092 controls. Socioeconomic status, marital status, sick leave and several demographic factors influenced risk for DSH. Specifically, low education (OR 7.44, 95% CI 6.82-8.12), current sick leave due to psychiatric disorders (OR 18.25, 95% CI 14.97-22.25) and being previously married (OR 3.83, 95% CI 3.37-4.36) showed the highest effect sizes. Importantly, there was an interaction between education and sick leave, where those with either low education and no sick leave (OR 13.33, 95% CI 11.66-15.23) or high education and sick leave (OR 18. 87, 95% CI 17.41-24.21) were the subgroups at highest risk.

CONCLUSION

DSH in young adults is associated with multiple sociodemographic and health disadvantages. Importantly, the two high-risk subgroups imply different pathways of risk and a need for differentiated preventative efforts.

Physical illness leading to absence from work and the risk of subsequent suicide: a national register-based study

BACKGROUND

Studies have shown that people with physical illness are at increased risk of suicide, but knowledge on the association between absence from work due to specific physical health problems and suicide risk is limited. This study aimed to examine the relationship between suicide risk and physical illness requiring leave from work across a range of specific physical diagnoses, and to study the interactions of mental illness and socioeconomic factors on this relationship.

METHODS

Using a nested case-control design, 9313 suicide cases and 169 235 matched controls were retrieved and interlinked from Norwegian national registries. Data on sick leave and related physical illness were derived from claims for sickness benefit and analyzed using conditional logistic regression.

RESULTS

For males, the risk of suicide increased progressively with the number of previous physical illness-related absences and the duration of recent physical illness-related absences. Absences related to digestive, musculoskeletal and neurological disorders as well as cancer and accidents/injuries were associated with a significantly increased risk of suicide. In contrast, females with a history of physical illness-related absence and a diagnosis of most organ or system specific illnesses were at a relatively reduced risk of suicide. In both genders, the suicide risk associated with physical illness resulting in absence from work differentiated significantly by history of sickness absence due to mental illness, and by education and income levels.

CONCLUSIONS

The risk of suicide associated with physical illness requiring leave from work varied significantly by gender and by education and income status.

Suicidal ideation from parents to their children: An association between parent's suicidal ideation and their children's suicidal ideation in South Korea

BACKGROUND

Suicide has been a major social and public health issue for Koreans, and currently, we are witnessing an increasing rate of teen suicides. This study's purpose was to investigate suicidal ideation in families by examining the associations between suicidal ideation between parents and their offspring using a representative sample of the Korean population.

METHODS

This cross-sectional study used data collected for the Korean National Health and Nutrition Examination Survey (KNHANES) from 2007 to 2013 and 2015. The study population consisted of 2324 adolescents 12 to 18 years-old and both parents. We used the chi-square test and logistic regression for the data analyses. The outcome variable was suicide ideation among adolescents adjusted for depressive symptoms, stress level, and the parental variables.

RESULTS

In total, 16.1% of the parents had suicidal ideation and 18.4% of the adolescents experienced suicidal ideation that was influenced by their parents. The adjusted odds ratio between the suicidal ideation of the parents and adolescents was 2.01 (95% CI 1.32-3.05). Depressive symptoms (AOR: 5.43, 95% CI 3.66-8.04) and stress level (AOR: 15.51 95% CI 6.14-39.19) were major risk factors for offspring's suicidal ideation. The association of the fathers' suicidal ideation with their offspring's suicidal ideation was greater than that of the mothers.

CONCLUSION

Knowing the risk factors of the offspring's suicidal ideation can prevent teen suicide and protect adolescents at risk. Thus, suicide prevention at the family level should be examined in relation to traditional risk factors at the individual level.

Association between lithium in tap water and suicide mortality rates in Miyazaki Prefecture

Background

Most studies have reported that suicide mortality rates are negatively associated with lithium levels in tap water; however, a few studies showed either no association or a positive association. Thus, the association between suicide mortality and lithium levels in tap water remains controversial. To clarify the association, our study evaluated the association between lithium levels in tap water and suicide mortality rates in Miyazaki Prefecture of Japan, after adjusting for confounding factors.

Methods

We measured lithium levels in tap water across the 26 municipalities of Miyazaki Prefecture in Japan. We examined the standardized mortality ratio (SMR) for suicide in each municipality and used the data as the average suicide SMRs over 5 years (2009–2013). Weighted least-squares regression analysis, adjusted for the size of each municipality’s population, was used to investigate the association between lithium levels in tap water and suicide SMRs. In addition to a crude model, in an adjusted model, potential confounding factors (proportion of elderly people, proportion of one-person households, annual marriage rate, annual mean income, unemployment rate, the density of medical doctors per 100,000 people, annual total rainfall, and proportion of people with a college education or higher) were added as covariates.

Results

We showed that male and female suicide SMRs were not associated with lithium levels in tap water in Miyazaki Prefecture. After adjusting for confounders, male suicide SMRs were significantly and positively associated with the proportion of elderly people in the population and annual total rainfall, and female suicide SMRs were associated with the proportion of elderly people in the population.

Conclusions

No association between lithium levels in tap water and suicide mortality rates was found in Miyazaki Prefecture.

Annual Research Review: A meta-analytic review of worldwide suicide rates in adolescents

Suicide is a leading cause of death among youth worldwide. The purpose of the current review was to examine recent cross-national trends in suicide mortality rates among 10- to 19-year-olds. This study extracted suicide mortality data from the World Health Organization's (WHO) Mortality Database for the most recent year (since 2010) from any country with available high-quality data (as defined by the WHO's guidelines). Data on access to lethal means (firearms, railways) and measures of economic quality (World Bank Income Group) and inequality (Gini coefficients) were obtained from publicly available data sources. Cross-national suicide mortality rates in youth were heterogeneous. The pooled estimate across all ages, sexes, and countries was 3.77/100,000 people. The highest suicide rates were found in Estonia, New Zealand, and Uzbekistan. Suicide rates were higher among older compared with younger adolescents and higher among males than females. The most common suicide methods were hanging/suffocation and jumping/lying in front of a moving object or jumping from a height. Firearm and railway access were related to suicide deaths by firearms and jumping/lying, respectively. Economic quality and inequality were not related to overall suicide mortality rates. However, economic inequality was correlated with a higher ratio of male:female suicides. This study provides a recent update of cross-national suicide trends in adolescents. Findings replicate prior patterns related to age, sex, geographic region, and common suicide methods. New to this review are findings relating suicide method accessibility to suicide mortality rates and the significant association between income inequality and the ratio of male:female suicide. Future research directions include expanding the worldwide coverage to more low- and middle-income countries, examining demographic groupings beyond binary sex and to race/ethnicity within countries, and clarifying factors that account for cross-national differences in suicide trends.

An association of economic hardship with depression and suicidality in times of recession in Greece

The interplay between objective and subjective measures of economic hardship on influencing mental health has not been explored during a period of enduring recession. The present study aims to fill this gap by investigating the relationship between income and economic difficulties in evoking major depression and suicidality in Greece, while taking into consideration gender differences. A random and representative sample of 2188 adults participated in a telephone survey in 2013 (response rate = 81%). Major depression and suicidality were assessed with the pertinent modules of SCID-IV; while financial difficulties were measured by the Index of Personal Economic Distress. Information on confounder variables was also gleaned. Income exerted an independent effect on major depression (OR = 0.37, 95%CI = 0.22-0.63), which was more pronounced among men than women. On the contrary, financial difficulties exerted a strong and independent effect on depression (OR = 1.16, 95%CI = 1.13-1.2). Income was found to bear a strong association with suicidality only among men; whereas financial difficulties were unrelated in both genders. Subjective and objective indices of economic hardship exert a differential impact on mental health outcomes amid recession. Gender-sensitive policies and interventions should be geared towards softening the social effects of the recession in the country.

Sex-Specific Impact of Changes in Job Status on Suicidal Ideation

Background: Around the globe, 800,000 people die from suicide every year. Despite being one of the leading causes of death, suicide remains a low public health priority. Korea has the second highest total suicide rate among Organisation for Economic Co-operation and Development (OECD) countries. Aims: The aim of this study was to explore how changes of job status influence suicidal risk in Korea, which lags behind other OECD countries in job security because temporary and part-time jobs are more prevalent in Korea. Method: We made use of a large longitudinal dataset, the Korea Health Panel (KHP). Results: Our findings revealed that a negative change in employment status increased the risk of suicide, but only for males. Limitations: Some individuals might intentionally change their job status, but the data do not indicate why the job status of an individual changes. Conclusion: These findings provide useful insights regarding the Korean labor market. In particular, tackling the issue of job stability, providing training polices for the unemployed and under-employed, and considering social insurance schemes may help to reduce suicide risk.

Risk factors for suicide in rural Italy: a case-control study

PURPOSE

Increased frequency of suicide in rural areas of Tuscany has been described since the 1970s. A case-control study was conducted in 2014 and 2015. The objective of this study was to identify major individual risk factors related to suicides in six rural districts of Tuscany.

METHODS

Cases were identified as all 128 suicides occurred in six rural districts between 2009 and 2013. Controls (three for each case) were matched for age, sex, and general practice. Information was collected from GPs using a structured questionnaire. Univariate and multivariate analyses were carried out to investigate the association between individual risk factors and suicide.

RESULTS

Informants for 91 cases of the 128 identified cases were successfully interviewed (response rate 71.1%). About 40.5-65.9% suicide cases and 11.4-20.0% of controls had some psychiatric pathology, accordingly to different definitions. Univariate conditional regression analysis showed that living in isolated houses (OR 2.48), living alone (OR 2.97), not being married (OR 2.63), low income (OR 2.73), psychiatric pathology (OR 9.70), psychotropic medication (OR 5.58), problems with relatives (OR 14.78), psychiatric family history (OR 5.67), and suicidal ideation (OR 15.61) were all risk factors. Practising religion (OR 0.27) was the only protective factor identified. Multivariate regression identified two independently and significantly associated variables namely, psychiatric pathology (OR 8.87) and living alone (OR 2.30).

CONCLUSIONS

Results of this study showed, similarly to recent research, that not all suicide events are the results of psychiatric pathology. Prevention strategies should, therefore, target both socio-economic and clinical risk factors.

Prevalence, clinical correlates and IQ of suicidal ideation in drug naïve Chinese Han patients with major depressive disorder

BACKGROUND

Suicidal ideation (SI) is a common and serious clinical concern in people with major depressive disorder (MDD). Inconsistent evidence suggests that individuals with SI may have a lower measured intelligence quotient (IQ) than those without SI. The aims of this study were to examine SI prevalence and its associations with demographic, clinical variables and IQ in Chinese drug-naïve MDD patients.

METHODS

488 drug-naïve Chinese Han patients (male: 203, 41.6%) meeting a DSM-IV diagnosis of MDD were enrolled in a cross-sectional study involving seven hospitals. All participants were asked to complete a series of questionnaires, which include information on socio-demographic and clinical variables. The Hamilton Depression Rating Scale (HAMD), Hamilton Anxiety Rating Scale (HAMA) and Brief Psychiatric Rating Scale (BPRS) were also administered. Verbal IQ (VIQ), performance IQ (PIQ) and full-scale IQ (FIQ) scores were measured using the Chinese version of the Wechsler Adult Intelligence Scale-Ⅲ (WAIS-Ⅲ). We categorized patients with SI based on a cut-off score of ≥3 on HAMD item 3.

RESULTS

An estimated prevalence 32.8% (160/488) of drug-naïve MDD patients experienced SI during the current episode of illness. Patients with SI were more likely to be divorced (x²= 6.93, p = 0.031), male (x²= 6.04, p = 0.014), had higher severity of depression and anxiety symptoms (t = -8.14, p < 0.001, t = -3.28, p < 0.001, respectively), comorbid psychotic features (t = -5.71, p < 0.001), and lower FIQ levels (t = -4.21, p < 0.001), when compared to patients without SI. Using logistic regression analysis and adjusting for confounding variables, the following variables were independently associated with SI: divorced marital status compared to married (OR=4.674, 95% CI: 1.676~13.036), severity of depression symptoms (OR=1.312, 95% CI: 1.196~1.440), psychotic features (OR=1.044; 1.012~1.077), and FIQ /PIQ levels which expressed in OR per SD increase in IQ score (OR=0.740, 95% CI: 0.561~0.977; OR=0.744, 95% CI: 0.557~0.994, respectively).

LIMITATIONS

A cross-sectional study which did not assess the influence of severity of SI.

CONCLUSIONS

The prevalence of SI in drug-naive Chinese patients with MDD is high, and associated with marital status, severity of depression, psychotic features and measured IQ. Further research is needed to further explore these and other potentially relevant risk factors which might affect clinical outcomes.

Blue-collar work and women's health: A systematic review of the evidence from 1990 to 2015

Despite the implications of gender and sex differences for health risks associated with blue-collar work, adverse health outcomes among blue-collar workers has been most frequently studied among men. The present study provides a "state-of-the-field" systematic review of the empiric evidence published on blue-collar women's health. We systematically reviewed literature related to the health of blue-collar women published between January 1, 1990 and December 31, 2015. We limited our review to peer-reviewed studies published in the English language on the health or health behaviors of women who were presently working or had previously worked in a blue-collar job. Studies were eligible for inclusion regardless of the number, age, or geographic region of blue-collar women in the study sample. We retained 177 studies that considered a wide range of health outcomes in study populations from 40 different countries. Overall, these studies suggested inferior health among female blue-collar workers as compared with either blue-collar males or other women. However, we noted several methodological limitations in addition to heterogeneity in study context and design, which inhibited comparison of results across publications. Methodological limitations of the extant literature, alongside the rapidly changing nature of women in the workplace, motivate further study on the health of blue-collar women. Efforts to identify specific mechanisms by which blue-collar work predisposes women to adverse health may be particularly valuable in informing future workplace-based and policy-level interventions.

Widening socioeconomic inequalities in Australian suicide, despite recent declines in suicide rates

PURPOSE

This study aims to investigate trends in socioeconomic inequalities of suicide from 1979 to 2013 for Australian males and females aged 15-34 years and 35-64 years.

METHODS

Data on suicides and population were obtained from national registries. An area-based measure of socioeconomic status (SES) was used, and categorized into low, middle, and high SES areas. Suicide rates for each SES groups were estimated using a negative binomial regression model, adjusted for confounders. Socioeconomic inequalities in suicide were assessed using absolute and relative risk of low-to-high SES areas. Secular changes in socioeconomic inequalities were assessed using trend tests for relative risk.

RESULTS

For young males, there was an increase in socioeconomic inequality driven by a significant decrease in suicide rates in high SES areas. For older males, inequality in suicide increased by 29%, which was related to a marked increase in suicide rates in low SES areas. Inequalities in both young and older female suicides also increased. These increases occurred when corresponding suicide rates in high SES areas decreased.

CONCLUSIONS

Recent widening socioeconomic inequalities in Australian suicide have been primarily associated with declines in suicide rates in high SES areas. However, an increasing inequality in older male suicide is linked with low SES. Efforts targeting people from poor areas, especially older males, should be considered when developing suicide prevention strategy.

Socio-economic status and risk for suicide by immigration background in Norway: A register-based national study

The relative importance of socio-economic factors on risk for suicide in the immigrant population may differ from that for the native population; however, few studies have addressed this issue on a national basis. With a nested case-control design and data from Norwegian population registers we identified 11,409 suicide cases in the years 1992-2012 and 191,785 sex-birthdate-matched controls. The influence of socio-economic factors on the risk for completed suicide was assessed through conditional logistic regression. Among 11,409 suicides, 1139 (10%) were individuals with an immigration background of either themselves or their parent(s). Suicide cases, as well as the controls, with an immigration background differed in several aspects of their socio-economic status from those without such a background. Being single or separated, divorced or widowed, was, however, associated with an increased risk of suicide regardless to the subjects' immigration background. Low level of education and low annual income significantly increased the risk for suicide in almost all the study subgroups. Living in the capital area was associated with a reduced risk of suicide in first-generation immigrants but an increased risk in native Norwegians. In conclusion, persons with an immigration background, as well as native Norwegians, shared most common risk factors for suicide, but the strength of associations between socio-economic factors and risk for suicide can differ by immigration background.

Suicide Risk Screening in Healthcare Settings: Identifying Males and Females at Risk

Suicide is the tenth leading cause of death in the United States, accounting for more than 42,000 deaths in 2014. Although this tragedy cuts across groups defined by age, gender, race/ethnicity, and geographic location, it is striking that nearly four times as many males as females die by suicide in the U.S. We describe the current regulations and recommendations for suicide risk screening in healthcare systems and also describe the aspirational goal of "Zero Suicide," put forth by the National Action Alliance for Suicide Prevention. We then provide information about suicide risk screening tools and steps to take when a patient screens positive for suicide risk. Given the substantially higher suicide rate among males than females, we argue that it is important to consider how we could optimize suicide risk screening strategies to identify males at risk and females at risk. Further research is needed to accomplish this goal. It is recommended that we consider multi-factorial suicide risk screens that incorporate risk factors known to be particularly important for males as well as computerized, adaptive screens that are tailored for the specific risk considerations of the individual patient, male or female. These strategies are not mutually exclusive. Finally, universal suicide risk screening in healthcare settings, especially primary care, specialty medical care, and emergency department settings, is recommended.

The area level association between suicide, deprivation, social fragmentation and population density in the Republic of Ireland: a national study

PURPOSE

Numerous studies have examined the ecological relationship between suicide and area level determinants such as deprivation and social fragmentation. In Ireland, there is considerable geographic variation in the rates of suicide. However, there is a dearth of Irish studies investigating the geographic variability of suicide.

METHODS

The Irish Central Statistics Office (CSO) provided data relating to all deaths by suicide and deaths of undetermined intent that occurred from 2009 to 2011. Negative binomial regression was used to examine the relationship between area level suicide rates and measures of deprivation, social fragmentation and population density that were taken from the 2011 National Census.

RESULTS

Overall deprivation had the strongest independent effect on small-area rates of suicide, with the most deprived areas showing the greatest risk of suicide (risk ratio = 2.1; 95 % CI 1.70-2.52). Low population density (rurality) was associated with an increased risk suicide in males across both age groups and among females in the older 40-64-year age group. Conversely, a weak association between high population density (urbanicity) and increased suicide risk was found among females in the 15-39-year age group. Associations with social fragmentation only became apparent in the sub group analysis. Social fragmentation was associated with an elevated risk of suicide in the older 40-64 age group, with this effect being most pronounced among females.

CONCLUSION

The findings of this study demonstrate marked geographical inequalities in the distribution of suicide in Ireland and highlight the importance of targeting suicide prevention resources in the most deprived areas.

[Unemployment, suicide- and homicide-rates in the EU countries]

BACKGROUND

While the link between the unemployment and the national suicide rates is confirmed by various studies, there are few investigations on the impact of unemployment on homicide rates. In particular, it is not known whether suicide and homicide are associated with the same socio-economic factors.

METHODS

Using linear regression method, the influence of unemployment rates, per capita incomes and annual alcohol consumption on suicide and homicide rates was examined in the 27 EU states.

RESULTS

We found a positive correlation between suicide and homicide rates. Unemployment among men is a strong predictor not only for suicide- but also for homicide rates. Suicide rates in men are also affected by the annual alcohol consumption. The suicide rates in women, however, correlate neither with socio-economic variables nor with alcohol consumption.

CONCLUSIONS

Unemployment seems to have a stronger impact on the male than on the female identity. Since the former is still highly dependent on predetermined social roles.

Demographic, Behavioral, and Psychiatric Risk Factors for Suicide

Abstract. Background: There have been very few prospective studies of death by suicide in the general population. Rather, studies of suicide have generally used psychological autopsies, a method that has the potential weakness of recall bias. Aims: To examine correlates of death by suicide among a community-based nonclinical sample prospectively assessed years before death by suicide. Method: We analyzed data from an epidemiological study of a 10-year birth cohort (n = 4,914) conducted in Israel in the 1980s, with follow-up mortality data over 25 years. Results: Eight participants died by suicide during follow-up (6/100,000 per year; mean follow-up to suicide = 18.3 ± 2.0 years), the majority of whom were rated as functioning relatively well at baseline. Male sex, psychiatric hospitalizations, major depressive disorder, and previous suicide attempts were associated with later suicide. Conclusion: In this nonclinical sample of persons assessed between ages 25 and 34, several correlates of suicide were identified, but the majority of persons who died by suicide were relatively high functioning at baseline. Major precursors of suicide may be more proximal factors of acute or chronic negative changes in life circumstances.

Economic crisis and suicidal behaviour: the role of unemployment, sex and age in Andalusia, southern Spain

INTRODUCTION

Although suicide rates have increased in some European countries in relation to the current economic crisis and austerity policies, that trend has not been observed in Spain. This study examines the impact of the economic crisis on suicide attempts, the previously neglected endpoint of the suicidal process, and its relation to unemployment, age and sex.

METHODS

The study was carried out in Andalusia, the most populated region of Spain, and which has a high level of unemployment. Information on suicide attempts attended by emergency services was extracted from the Health Emergencies Public Enterprise Information System (SIEPES). Suicide attempts occurring between 2003 and 2012 were included, in order to cover five years prior to the crisis (2003-2007) and five years after its onset (2008-2012). Information was retrieved from 24,380 cases (11,494 men and 12,886 women) on sex, age, address, and type of attention provided. Age-adjusted suicide attempt rates were calculated. Excess numbers of attempts from 2008 to 2012 were estimated for each sex using historical trends of the five previous years, through time regression models using negative binomial regression analysis. To assess the association between unemployment and suicide attempts rates, linear regression models with fixed effects were performed.

RESULTS

A sharp increase in suicide attempt rates in Andalusia was detected after the onset of the crisis, both in men and in women. Adults aged 35 to 54 years were the most affected in both sexes. Suicide attempt rates were associated with unemployment rates in men, accounting for almost half of the cases during the five initial years of the crisis. Women were also affected during the recession period but this association could not be specifically attributed to unemployment.

CONCLUSIONS

This study enhances our understanding of the potential effects of the economic crisis on the rapidly increasing suicide attempt rates in women and men, and the association of unemployment with growing suicidal behaviour in men. Research on the suicide effects of the economic crisis may need to take into account earlier stages of the suicidal process, and that this effect may differ by age and sex.

Risk factors for suicidal behaviour in individuals on disability pension due to common mental disorders - a nationwide register-based prospective cohort study in Sweden

BACKGROUND

Common mental disorders (CMD) have become one of the leading causes for disability pension (DP). Studies on predictors of adverse health outcome following DP are sparse. This study aimed to examine the association of different socio-demographic factors and health care consumption with subsequent suicidal behaviour among individuals on DP due to CMD.

METHOD

This is a population-based prospective cohort study based on register data. All individuals aged 18-64 years, living in Sweden on 31-Dec-2004 who in 2005 were on DP due to CMD (N = 46 745) were followed regarding suicide attempt and suicide (2006-10). Univariate and multivariate hazard ratios (HR) and 95% confidence intervals (CI) for suicidal behaviour were estimated by Cox regression.

RESULTS

During the five-year follow-up, 1 046 (2.2%) and 210 (0.4%) individuals attempted and committed suicide, respectively. Multivariate analyses showed that young age (18-24 years) and low education predicted suicide attempt, while living alone was associated with both higher suicide attempt and suicide (range of HRs 1.23 to 1.68). Combined prescription of antidepressants with anxiolytics during 2005 and inpatient care due to mental diagnoses or suicide attempt (2001-05) were strongly associated with suicide attempt and suicide (range of HRs 1.3 to 4.9), while inpatient care due to somatic diagnoses and specialized outpatient care due to mental diagnoses during 2001-05 only predicted suicide attempt (HR 1.45; 95% CI: 1.3-1.7; HR 1.30; 95% CI: 1.1-1.7).

CONCLUSIONS

Along with socio-demographic factors, it is very important to consider type of previous healthcare use and medication history when designing further research or intervention aiming at individuals on DP due to CMD. Further research is warranted to investigate both characteristics of disability pension due to CMD, like duration, diagnoses and grade as well as mechanisms to subsequent suicidal behavior, taking potential gender differences into consideration.

Cardiovascular fitness in early adulthood and future suicidal behaviour in men followed for up to 42 years

BACKGROUND

Cardiovascular fitness influences many aspects of brain function. However, the relationship between cardiovascular fitness and suicidal behaviour is unknown. Therefore, we aimed to determine whether cardiovascular fitness at age 18 years is associated with future risk of suicide attempt/death.

METHOD

We performed a population-based Swedish longitudinal cohort study of male conscripts with no previous or ongoing mental illness (n = 1,136,527). The conscription examination, which took place during 1968-2005, included the cycle ergonometric test and tests of cognitive performance. Future risk of suicide attempt/death over a 5- to 42-year follow-up period was calculated with Cox proportional hazards models controlling for several confounders including familial factors.

RESULTS

At least one suicide attempt was recorded for 12,563 men. Death by suicide without a prior attempt was recorded in 4814 additional individuals. In fully adjusted models low cardiovascular fitness was associated with increased risk for future attempt/death by suicide [hazard ratio (HR) 1.79, 95% confidence interval (CI) 1.64-1.94]. The HR changed only marginally after exclusion of persons who received in-patient care for depression (HR 1.76, 95% CI 1.61-1.94). Poor performance on both the cardiovascular fitness and cognitive tests was associated with a fivefold increased risk of suicide attempt or suicide death (HR 5.46, 95% CI 4.78-6.24).

CONCLUSIONS

Lower cardiovascular fitness at age 18 years was, after adjustment for a number of potential confounders, associated with an increased risk of attempt/death by suicide in adulthood. It remains to be clarified whether interventions designed to improve fitness in teens can influence the risk of suicidal behaviour later in life.

Differential association of socio-economic status with gender- and age-defined suicidal ideation among adult and elderly individuals in South Korea

South Korea has the highest suicide rate among countries in the Organisation for Economic Co-operation and Development (OECD), with a rising trend that contrasts with the trend in most other OECD countries. This study assessed differential associations of socio-demographic factors with suicidal ideation in South Korea. We used five waves of data from the 2010 Korea National Health and Nutrition Examination Survey. Study subjects included 5803 men and women aged >25 years. We analysed weighted percentages with consideration of the complex survey sample design and unequal weights. Surveylogistic regressions were applied. Protective effects against suicidal ideation were found for higher household income, higher educational attainment, and being married. Functional limitations and depressive symptoms were risk factors for suicidal ideation. However, these significant factors may exert different effects on vulnerability for suicidal ideation among different genders and age groups. Thus, household income was mainly protective for women and subjects aged 25-44 years, and educational attainment was protective for individuals aged >65 years. Our findings suggest the need for extended social protection policies for the less privileged population and special strategies for different groups.

Gender differences of suicide in Japan, 1947-2010

BACKGROUND

The effects of socio-economic factors on suicide were gender-dependent. Japanese suicide mortality gender ratio (male: female) had gradually increased during the twentieth century.

METHODS

With the data covering 1947-2010 collected from Japanese official websites, we conducted non-parametric rank test, curve estimations, spearman ranking correlation and quantile regression in succession with Stata version 12.0.

RESULTS

The suicide mortality rate in male with a "U" shape had been always higher than that in female with a "J" shape. The male suicide mortality peaked around in 1955 (38.5 per 100,000 populations), dropped quickly afterwards until the 1970s; it increased in the 1980s with another peak in 2003 (33.2 per 100,000 populations). For female, an overall decreasing trend was seen with a peak during the 1950s (23.5 per 100,000 populations in 1958). It dropped gradually afterwards with small variations in 1970s and 80s, and was stabilized after 1995 (9.3 per 100,000 populations). The unemployment rate could be used as a single positive predictor of suicide mortality for men (p<0.01), while the total fertility rate (TFR) (p<0.01) and divorce rate (p<0.01) were significantly associated positively and negatively with women's suicide, respectively.

LIMITATIONS

The impact of mental disorders was not analyzed and age-specific analysis was not conducted.

CONCLUSION

The findings of these gender differences in, and the associated factors with, suicide in Japan, warranted further studies including delineation of the implications of differential economic pressure between genders, as well as child-rearing pressure and marriage satisfaction.

Household composition and suicidal behaviour in the adult population of Belgium

PURPOSE

We aimed to estimate the prevalence of suicidal behaviours, i.e. ideation and attempt, in the adult population of Belgium, and to explore their association with household composition.

METHODS

Data of 4,459 adults (25-64 years) from the 2004 Belgian Health Interview Survey were used for analyses. Bivariate and multivariate logistic regressions were used to calculate the odds of engaging in suicidal behaviours according to household type, further controlling for age, sex, income, employment status and social support.

RESULTS

Lifetime prevalence of ideation and attempts was 14 and 4.7 %, respectively. Current prevalence of ideation was 4.0 % and past year prevalence of attempts was 0.5 %. Compared to other household compositions, living alone (A) and as lone parent (P) increased the odds of lifetime and current suicidal thoughts (ORA 2.3, 95 % CI 1.7-2.9 and ORP 3.8, 95 % CI 1.9-7.7) and lifetime attempts (ORA 2.3, 95 % CI 1.4-3.6 and ORP 4.5, 95 % CI 2.4-8.5). When controlling for confounders, single person and single parent households still presented increased adjusted-odds of lifetime and current suicidal thoughts (a-ORA 1.8, 95 % CI 1.1-2.9 and a-ORP 2.3, 95 % CI 1.0-5.5). The likelihood of ever attempted suicide was also higher among single parent households (a-ORP 4.5, 95 % CI 2.4-8.5) after adjustment, but not among those living alone (a-ORA 1.4, 95 % CI 0.8-2.8).

CONCLUSION

Living alone or as lone parent place adults at higher risk for suicide behaviour, and this is only partly explained by lower socio-economic status or poor perceived support.

Are there differences in injury mortality among refugees and immigrants compared with native-born?

BACKGROUND

The authors studied injury mortality in Denmark among refugees and immigrants compared with that among native Danes.

METHOD

A register-based, historical prospective cohort design. All refugees (n=29, 139) and family reunited immigrants (n=27, 134) who between 1 January 1993 and 31 December 1999 received residence permission were included and matched 1:4 on age and sex with native Danes. Civil registration numbers were cross-linked to the Register of Causes of Death, and fatalities due to unintentional and intentional injuries were identified based on ICD-10 diagnosis. Sex-specific mortality ratios were estimated by migrant status and region of birth, adjusting for age and income and using a Cox regression model after a median follow-up of 11-12 years.

RESULTS

Compared with native Danes, both female (RR=0.44; 95% CI 0.23 to 0.83) and male (RR=0.40; 95% CI 0.29 to 0.56) refugees as well as female (RR=0.40; 95% CI 0.21 to 0.76) and male (RR=0.22; 95% CI 0.12 to 0.42) immigrants had significantly lower mortality from unintentional injuries. Suicide rates were significantly lower for male refugees (RR=0.38; 95% CI 0.24 to 0.61) and male immigrants (RR=0.24; 95% CI 0.10 to 0.59), whereas their female counterparts showed no significant differences. Only immigrant women had a significantly higher homicide rate (RR=3.09; 95% CI 1.11 to 8.60) compared with native Danes.

CONCLUSIONS

Overall results were advantageous to migrant groups. Research efforts should concentrate on investigating protective factors among migrants, which may benefit injury prevention in the majority population.

Cognitive ability in early adulthood is associated with later suicide and suicide attempt: the role of risk factors over the life course

BACKGROUND

Cognitive ability/intelligence quotient (IQ) in youth has previously been associated with subsequent completed and attempted suicide, but little is known about the mechanisms underlying the associations. This study aims to assess the roles of various risk factors over the life course in explaining the observed relationships.

METHOD

The present investigation is a cohort study based on data on IQ test performance and covariates, recorded on 49 321 Swedish men conscripted in 1969-1970, at ages 18-20 years. Information on suicides and hospital admissions for suicide attempt up to the age of 57 years, childhood and adult socio-economic position, and adult family formation, was obtained from linkage to national registers.

RESULTS

Lower IQ was associated with increased risks of both suicide and suicide attempt during the 36 years of follow-up. The associations followed a dose-response pattern. They were attenuated by approximately 45% in models controlling for social background, mental ill-health, aspects of personality and behavior, adult socio-economic position and family formation. Based on one-unit decreases in IQ test performance on a nine-point scale, the hazard ratios between ages 35 and 57 years were: for suicide 1.19 [95% confidence interval (CI) 1.13-1.25], fully adjusted 1.10 (95% CI 1.04-1.18); and for suicide attempt 1.25 (95% CI 1.20-1.31), fully adjusted 1.14 (95% CI 1.09-1.20).

CONCLUSIONS

Cognitive ability was found to be associated with subsequent completed and attempted suicide. The associations were attenuated by 45% after controlling for risk factors measured over the life course. Psychiatric diagnosis, maladjustment and aspects of personality in young adulthood, and social circumstances in later adulthood, contributed in attenuating the associations.

Preference of lethal methods is not the only cause for higher suicide rates in males

BACKGROUND

In most countries worldwide suicide rates are higher for males whereas attempted suicide rates are higher for females. The aim is to investigate if the choice of more lethal methods by males explains gender differences in suicide rates.

METHODS

Data on completed and attempted suicides were collected (n=3235, Nuremberg and Wuerzburg, years 2000-2004). The research question was analyzed by comparing the method-specific case fatality (= completed suicides/completed+attempted suicides) for males and females.

RESULTS

Among the events captured, men chose high-risk methods like hanging significantly more often than women (φ=-0.27; p<0.001). However, except for drowning, case fatalities were higher for males than for females within each method. This was most apparent in "hanging" (men 83.5%, women 55.3%; φ=-0.28; p<0.001) and "poisoning by drugs" (men 7.2%, women 3.4%; φ=-0.09; p<0.001).

LIMITATIONS

The sample size (n=3235) was not enough for comparing method and gender specific case fatalities with a fine-meshed stratification regarding age.

CONCLUSIONS

Higher suicide rates in males not only result from the choice of more lethal methods. Other factors have to be considered.