Gender differences in unipolar depression: an update of epidemiological findings and possible explanations

OBJECTIVE: To give an update on epidemiological findings on sex differences in the prevalence of unipolar depression and putative risk factors. MATERIAL AND METHODS: Systematic review of the literature. RESULTS: Recent epidemiological research yields additional evidence for a female preponderance in unipolar depression, holding true across different cultural settings. Current explanations include artefacts, genetic, hormonal, psychological and psychosocial risk factors. Rather consistently, intrapsychic and psychosocial gender role related risk factors have been identified which may contribute to the higher depression risk in women. Gender role aspects are also reflected in endocrine stress reactions and possibly influence associated neuropsychological processes. CONCLUSION: There is a need for more integrative models taking into account psychological, psychosocial, and macrosocial risk factors as well as their interactions, which also connect these factors with physiological and endocrine responses. Furthermore, it is conceivable that across the life span, as well as across cultural settings, individual risk factors will add with varying emphasis to the higher prevalence of depression in women.     

Gender differences in psychiatric symptoms related to suicidal ideation in Japanese patients with depression

Recent figures show that more than 30,000 people suicide each year in Japan, and that many of them are considered to suffer from depression. In addition, the suicide rate among Japanese women has been shown to be higher than in other countries. However, it is not clear whether the psychiatric symptoms leading to suicide differ by gender. The authors examined gender differences in psychiatric symptoms related to suicidal ideation (SI) in Japanese patients with depression. Study subjects were 199 new patients (66 men and 133 women) who were diagnosed with a major depressive disorder. SI and psychiatric symptoms were assessed by several psychological tests using questionnaires. Logistic regression analysis was used to calculate the odds ratio (OR) and 95% confidence interval (CI) with an adjustment for all relevant factors simultaneously. The stepwise method was also used for selecting variables. In univariate analysis, several psychosocial factors such as self-reproach, derealization, depressive moods, depersonalization, and anxiety traits were statistically significantly associated with SI in both men and women. However, multivariate analysis using the stepwise method distinguished gender differences. Low social/family support and depersonalization were statistically significantly associated with SI in men, while depressive moods and an anxiety state were significantly associated with SI in women. The relation between derealization and SI was statistically significant in women but not significant in men.     

难治性抑郁症患者的危险因素分析

目的:探讨难治性抑郁症的相关危险因素。方法:将100例符合难治性抑郁症诊断标准的抑郁症患者与同期的非难治性抑郁症患者进行1∶1配比病例对照研究,采用自编一般情况调查表、人格诊断问卷(PDQ-4)、艾森克人格问卷(EPQ)、社会支持量表以及生活事件量表对入组的抑郁症患者进行调查和评定,应用条件Logistic回归分析方法处理数据。结果:多因素条件Logistic回归分析表明,难治性抑郁症的危险因素是:应激性生活事件(OR=3.725,95%CI:1.684～7.282),社会支持差(OR=4.257,95%CI:1.790～9.887),神经质(OR=4.124,95%CI:1.776～8.231),伴人格障碍(OR=4.875,95%CI:2.432～10.245),伴人格解体(OR=0.384,95%CI:0.156～0.898),伴强迫症状(OR=0.401,95%CI:0.219～0.976),1年内未及时治疗(OR=0.406,95%CI:0.206～0.844)。结论:具有应激性生活事件、社会支持差、伴人格障碍、神经质(EPQ-N量表分)、伴人格解体症状、伴强迫症状、1年内未及时治疗是难治性抑郁症的主要危险因素。     

Gender differences in depression: historical changes.

Depression has been widely reported to be more prevalent among females than among males. In this study we demonstrate that gender differences in depression occur only among individuals born during particular historical periods, and test the utility of a model focusing on changes in women's opportunities for academic and professional achievement in predicting periods of significant gender differences in depression. Based on reanalysis of data reported by Klerman et al., we find gender differences in depression among people 40 years of age and older to be high among cohorts that reach adolescence during periods of increasing opportunities for female achievement. Among cohorts that reach adolescence during periods of stable or decreasing opportunities for women, gender differences in depression are not significant at any age.     

抑郁症的性别差异

目的：比较男女住院抑郁症患者的起病年龄、症状等的差异。方法：收集抑郁症患者临床资料和评定汉密尔顿抑郁量表（HAMD,17）,进行性别间的比较分析。结果：女性患者首发年龄早于男性,且20岁以前发病者多于男性;女性患者病程长于男性,发病次数也多于男性;男性患者未婚比例显著高于女性;男性患者在迟滞、疑病、自知力缺乏和阻滞等症状突出,而女性患者以激越、全身症状、躯体焦虑和睡眠障碍等为主。女性患者发病前生活事件多于男性。结论：男性和女性抑郁症患者在发病年龄、发病诱因、症状特点等方面存在一定的差异。     

Gender differences in depression and PTSD symptoms following combat exposure

Background: This research examined gender as a moderator of the association between combat exposure (CE) and depression as well as CE and PTSD symptoms among a nonclinical sample of Soldiers following deployment in support of operations in Afghanistan and Iraq. Methods: Cases included 6,943 (516 women, 6,427 men) active duty Soldiers that were retrospectively analyzed from a pre‐ and post‐deployment screening database at a large Army installation. Results: Gender moderated the association between CE and depressive and PTSD symptoms such that higher levels of CE were more strongly associated with depression and PTSD symptoms in women compared to men. Female Soldiers also reported higher severity of depressive symptoms compared to male Soldiers, whereas men reported higher levels of CE and a greater number of previous deployments compared to women. Conclusions: CE was a stronger predictor of post‐deployment depression and PTSD symptoms for women compared to men. These results provide evidence for gender‐based differences in depression and PTSD risk. Screening for degree of CE in addition to symptoms associated with depression and PTSD can help with the care for service members who are returning from deployments to combat zones. Depression and Anxiety, 2010. Published 2010 Wiley‐Liss, Inc.     

Beck's Depression Inventory as a screening instrument for adolescent depression in Sweden: gender differences

Beck's Depression Inventory was administered in a study of all students aged 16–17 years in the first year of high school in a Swedish town, and was completed by 93% of them (n=2270). Cronbach's reliability coefficient alpha was 0.89, and there were strong correlations between item scores and total scores. A diagnostic interview focused on depressive diagnosis during the last year was conducted with 88% (n=199) of all students with high scores (≥16), and with the same number of controls with low scores. A depressive diagnosis was confirmed in 73% of high scorers and 13% of low scorers. The questionnaire performed better with girls than with boys. The mean score was significantly higher for girls, and the proposed limit for moderate depression (a score of 16) was reached by 14.2% of girls and 4.8% of boys. All symptoms were significantly more frequent and more severe in girls. It was found that 20% of girls and 6% of boys reported suicidal ideation. In a factor analysis the strongest factor that emerged differed between the sexes. For boys it included sadness, crying and suicidal ideation, and for girls it included failure, guilt, self-dislike and feeling unattractive, combined with suicidal ideation. The gender differences are discussed.     

Gender differences of depressive symptoms in depressed and nondepressed elderly persons.

OBJECTIVES: Women suffer more frequently from major depression and depressive symptoms than men. The somatic and the atypical subtype of depression seem to be more prevalent in women. However, few studies investigated gender differences of depressive symptoms in the elderly. These gender differences in the elderly will be investigated in the present study. METHODS: In the course of a family study 236 subjects with a lifetime diagnosis of major depression aged > 50 years and 357 control subjects from the general population matched for age and gender were questioned using the Composite International Diagnostic Interview (CIDI). Chi-square tests were used to compare the individual depressive symptoms between men and women and logistic regression analyses were performed to account for the subjects' age, cognitive performance, family and employment status. RESULTS: Women in the general population suffered from more depressive symptoms than men and had more appetite disturbance and joylessness. These gender differences could be entirely explained by gender differences in the family and the employment status. Men and women with a major depressive disorder presented with a distinct profile of symptoms that could not be explained by psychosocial factors: elderly depressed women presented with more appetite disturbances and elderly depressed men with more agitation. CONCLUSION: Major depression in the elderly presents with partially different symptoms in men and women. The results suggest that the gender differences in the symptoms of major depression in the elderly reflect gender differences in the perception and the expression of depressive syndromes.     

Gender differences in the psychopathology of depressed inpatients

Abstract. In the last few years there has been increased scientific effort to describe the gender–specific psychopathological features of depression. Until now these studies have not been entirely conclusive, which could be the result of methodological difficulties. This report investigates sex differences in the symptom presentation in an inpatient population: 104 female and 113 male patients suffering from a depressive episode according to ICD–10 were admitted to the inpatient treatment at the Department of General Psychiatry in Vienna. A psychopathological rating according to the standardized documentation system of the AMDP (Association for Methodology and Documentation in Psychiatry) was performed at admission and discharge. At admission into the hospital women tended to show more affective lability (p = 0.025), whereas men had higher scores in affective rigidity (p = 0.032), blunted affect (p = 0.002), decreased libido (p = 0.028), hypochondriasis (p = 0.016) and hypochondriac delusions (p = 0.039). At discharge from the hospital women had significantly higher scores in dysphoria (p = 0.010), while men were more prone to have compulsive impulses (p = 0.030). Although our results were obtained in a selected sample of inpatients at a university hospital, they are indicative of psychopathological differences between men and women in the core symptoms of depression. These differences may influence diagnostic practice and gender specific treatment of depression.*Both authors contributed equally     

Sex differences in risk factors for suicide after attempted suicide

Abstract.Aim: This study aims to investigate suicide risk factors after attempted suicide and whether and how these risk factors differ between the sexes.Method: A total of 1052 suicide attempters admitted to the Medical Emergency Inpatient Unit, Lund University Hospital, Sweden were followed up concerning suicide and death from other causes after a median period of 6 years and 5 months. In all, 50 persons committed suicide during follow-up. At the index suicide attempt, socio-demographic data and information about clinical characteristics were gathered in a standardised manner. Risk factors were identified among these data using survival analyses for the whole sample and for each sex separately.Result: Men had a higher frequency of suicide and a greater overall mortality than women. Cox regressions showed that suicide attempt(s) prior to the index attempt and the use of a violent method for the index attempt were risk factors for men only, whereas older age and a high suicidal intent (Beck SIS score) were female ones. Major depression was a risk factor for both sexes.Conclusion: More attention probably needs to be paid to the importance of gender in assessment of suicide risk and treatment of suicide attempters.     

Sex differences in the use of coping strategies: predictors of anxiety and depressive symptoms

This study examined sex differences in the use of coping strategies and their relationship to depression and anxiety-related psychopathology. Responses on measures of coping strategies, depression, and anxiety were obtained from a carefully screened nonclinical sample (N = 107). The results demonstrated that women who used less positive reframing had higher levels of depressive symptoms compared with women who used more positive reframing and to men irrespective of their use of more or less positive reframing. In addition, women who reported the use of more self-blame had elevated levels of trait anxiety, although a similar effect was not found for men. The observed sex differences in the use of coping strategies and their association with depression and anxiety-related problems underscores differences in the clinical presentation of anxiety and depression between women and men.     

Early-life risk factors for late-onset depression

OBJECTIVE: To assess differences between women with no history of depression (No MDD), early-onset depression (EOD), and late-onset depression (LOD) on psychosocial risk factors (marital conflict and lack of social support), neuroticism, and overall self-rated health. METHOD: Diagnostic data from a community-based longitudinal study of women at mean ages 39, 42, 48, and 59 was used to create three groups of women (No MDD, EOD and LOD). These groups were then compared on psychosocial, personality, and overall health risk assessed approximately 10 years prior to diagnosis. RESULTS: There were no differences between the groups on marital conflict and social support. Those with EOD scored higher than those in the LOD and No MDD groups on neuroticism. Importantly, those with LOD reported poorer health than those with No MDD 10 years prior to diagnosis. CONCLUSIONS: These findings provide support for the notion that poor health and not psychosocial risk factors or neuroticism predispose otherwise healthy adults to developing depression for the first time in late-life.     

Sex-specific associations of depressive symptoms and cardiovascular risk factors in older adults

Objectives: To examine sex-specific associations between depressive symptoms and cardiovascular risk factors in older men and women.

Method: One hundred and thirty-one healthy, community-dwelling older adults [mean age = 66(6.59), 63% male] completed the Beck depression inventory, and engaged in assessment of systolic and diastolic blood pressure, body mass index (BMI), waist circumference (WC), fasting total, low- and high-density lipoprotein cholesterol (TC, LDL-C, and HDL-C), triglycerides, glucose, insulin, and maximal aerobic capacity (Vo2max). Sex-stratified hierarchical regression analyses examined the association between depressive symptoms and each risk factor adjusting for age, education, and BMI (select models).

Results: Significant associations were found between higher levels of depressive symptoms and greater BMI, WC, insulin, LDL-C, and lower Vo2max in women only (p < 0.05). The insulin association was partially mediated by BMI.

Conclusion: In healthy older women, but not men, higher levels of depressive symptoms were associated with greater CVD risk factors. Depressive symptoms may confer biobehavioral risk for cardiovascular and metabolic diseases in older women in part via their association with pertinent biomedical risk factors.     

Gender differences in the contributions of risk factors to depressive symptoms among the elderly persons dwelling in a community, Japan

OBJECTIVE: To examine the relative importance of risk factors associated with depressive symptoms and gender differences in exposure to the risk factors among the elderly persons living in the community. METHODS: The data came from the Minamifurano-town Aging Study, a community-based sample of non-institutionalized elderly persons aged 65 years or older. Of the 731 eligible subjects, 665 were assessed for four domains of the potential risk factors (demographic characteristics, health and disability, stress, and social networks) and depressive symptoms according to the 30-item Geriatric Depression Scale (GDS). RESULTS: The mean overall GDS-score was 10.9 (SD 6.2), 10.2 (SD 6.0) in men and 11.6 (SD 6.4) in women. The stress domain in men and the health and disability domain in women contributed most to the explanation of the variation in the GDS-score. CONCLUSION: 'Stress' for men and 'health and disability status' for women were important factors associated with depressive symptoms. Future studies should determine whether modification of these factors may prevent depression among the elderly persons living in the community.     

Deliberate self-harm in young people: differences in prevalence and risk factors between The Netherlands and Belgium

Background This study aimed to examine prevalence and risk factors of deliberate self-harm in Dutch and Dutch-speaking Belgian adolescents. Method A cross sectional survey using an anonymous self report questionnaire was performed in both countries. Data on 4,431 Belgian and 4,458 Dutch 15–16 year-old school pupils were analyzed. Results Results showed a significant difference between the two countries indicating that lifetime and past year prevalence of deliberate self-harm were both 2.8 times higher in Belgian adolescents than in Dutch adolescents. Further analyses identified differences in the prevalence of factors associated with deliberate self-harm, with Belgian adolescents showing significant higher scores on anxiety, less problem-oriented coping and more common use of alcohol and soft drugs. Belgian adolescents were also at higher risk for the experience of several life events in the previous year and before that such as conflicts with peers, parents and partner, being bullied at school or exposure to suicidal behavior in family and friends. In addition, Belgian adolescents showed less communication with family or teachers about their problems and difficulties. Conclusions The results of the study suggest that the increased risk of deliberate self-harm among Belgian adolescents may be associated with an increased reporting of several important life events and with additional ineffective problem-solving such as less problem-oriented coping, more substance use and less communication about their problems. These results support the assumption that sociocultural aspects of nations can influence the risk of deliberate self-harm and are important to consider when developing prevention strategies.     

Prevalence and risk factors of depression in the elderly nursing home residents in Singapore

Objectives: Depression is a common health problem in elderly nursing home (NH) residents and is often under-recognized and under-treated. This study aimed to determine the prevalence rates of depression and identify the risk factors associated with depression in the elderly NH population in Singapore.

Methods: A sample of 375 residents in six NHs in Singapore, aged 55 years and above, was assessed with the Structural Clinical Interview (SCID), based on the Diagnostic and Statistical Manual of Mental Disorders, fourth edition (DSM-IV) criteria. The association of demographic, functional and health-related characteristics with depression was examined using multivariate logistic regression analyses.

Results: Overall point prevalence for depression in the elderly NH residents was found to be 21.1% (95% confidence intervals (CI): 17.1%–25.6%). The prevalence rate for minor depression in the elderly NH residents was 14.4% (95% CI: 11.1%–18.5%) and 6.7% (95% CI: 4.5%–9.8%) for major depression. Significant risk factors that were found to be associated with depression were length of stay for more than 2 years, known history of depression, pain, and no or lack of social contact.

Conclusion: The prevalence rates for depression were high among NH residents in Singapore. More attention is needed to care for the psychosocial needs of elderly NH residents in Singapore.