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Geriatric Depression: Does Gender Make a Difference?

  • Helen Lavretsky, MD, MS
Oct 1, 2002
Volume: 
19
Issue: 
10
  • Geriatric Psychiatry, Comorbidity In Psychiatry, Depression, Major Depressive Disorder, Schizophrenia
Table

Our society is experiencing significant demographic changes that are altering the profile of late-life depression in the United States. Both men and women are living longer, but the gender gap in longevity is widening. This disparity introduces a puzzling paradox: In the United States, women report more illnesses and health care utilization on average than men, despite the consistently greater life expectancy of women (Riley, 1990). Given the greater prevalence of depression in women compared to men, we are likely to see a correspondingly greater prevalence of geriatric depression in years to come. Similarly, data from the Centers for Disease Control and Prevention (2002) show that men have higher rates of completed suicide, despite the fact that women suffer from depression more frequently. There are many proposed explanations for these paradoxes, including sociocultural, biological and genetic causes.

Diagnosing depression in the elderly may be difficult in late life due to the presence of medical comorbidity, cognitive impairment, multiple losses, heterogeneity and atypical features. Reported prevalence rates for clinical depression in individuals older than 65 years of age range from 11% to 25% among patients in primary care and nursing home settings and at about 3% among healthy elderly living in the community (Brown et al., 2002; Lebowitz et al., 1997).

Differences in Prevalence Among Men and Women

Large epidemiologic studies report higher rates of depression among women, with about 4% of women and 1.7% of men carrying the diagnosis of major depression. The Epidemiologic Catchment Area-reported prevalence of major depression is 0.1% to 0.8% for men and 0.6% to 1% for women after age 65 (Nolen-Hoeksema, 1995). The differences appear to be age-specific with little difference in childhood, a considerable difference in mid-life (due to a sharp rise of depression in females), and a decrease in this difference in older age (Jorm, 1987). Some data suggest that the incidence of depression for women in the postmenopausal period may decrease relative to its incidence in men, although earlier research suggested that the difference in rates of depression between men and women become progressively smaller and may disappear among members of older age groups (Blazer and Williams, 1980). The explanation for this reduction is not yet available.

Gender Differences in Risk Factors

The pattern of depressive symptoms does not appear to be different between men and women (Sonnenberg et al., 2000), although the course and outcomes may differ. While higher rates of chronicity and recurrence of depression in younger adult women has been reported in several longitudinal studies (Kornstein, 1997), the male gender is reportedly associated with poorer outcomes of late-life depression in patient sample-based longitudinal studies (Baldwin and Jolley, 1986).

Research on gender differences in risk factors for late-life depression is limited. Family history of depression remains the best-known genetic risk factor for depression in both genders, but even this factor has limited predictive value. In a community-based study of depression in Australian twins, only moderate familial aggregation of depression occurred in women, "with heritability estimates ranging from 36% to 44%. In men, depression was only modestly familial, and thus, individual environmental factors played a larger role in the development of depression" (Bierut et al., 1999).

Biological theories point to the hormonal changes that occur in women during the critical periods of puberty, childbirth and menopause in explaining gender differences in depression rates. Gender differences in affective disorders' prevalence have been ascribed to variations in the levels or activity of monoamine transmitters, which are themselves changed by gonadal hormones. Halbreich et al. (1984) wrote, "Several aspects connected with the monoamine biosynthesis, availability, uptake and metabolism were found to be more abnormal in normal women and depressed women, as compared to men." However, many studies failed to confirm increased rates of depression in postmenopausal women.

Differences in Patterns of Attachment and Loss

Behavioral theories try to explain differences in rates of depression according to gender differences in attachment patterns: women base their self-esteem on their relationships with others; they are less assertive and lack confidence in controlling their lives. Stressors of late life include multiple losses/negative changes in relationships, employment, financial status and health problems. Retirement has been considered a major stressor for men as widowhood has been for women. In a recent community study of widowhood and depression, however, widowhood was more "depressogenic" in men compared to women (van Grootheest et al., 1999). Maciejewski et al. (2001) examined gender differences in event-related risk for major depression and found a three times greater likelihood for women to develop depression in response to stressful events as compared to men. With the dramatic changes in the workforce, most of these theories may change.

Medical Comorbidity and Late-Life Depression

Geriatric depression often occurs concurrently with a variety of chronic medical illnesses. Depression associated with the presence of chronic medical illness also increases the incidence of premature mortality, primarily from increased rates of cardiovascular and cancer deaths. Okiishi and colleagues (2001) reviewed the literature on gender differences in depression associated with neurological illness. They found a female preponderance of depression in diffuse neurological disease but not in focal neurological disease.

Men are generally known to have higher gender-specific mortality rates caused by smoking, heart disease, atherosclerosis and cerebrovascular disease, which may contribute to a changing sex-ratio in rates of late-onset depression with onset after age 60 (Lavretsky, 1998).

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References: 

References
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3. Bierut LJ, Heath AC, Bucholz KK et al. (1999), Major depressive disorder in a community-based twin sample: are there different genetic and environmental contributions for men and women? Arch Gen Psychiatry 56(6):557-563.
4. Blazer D, Williams CD (1980), Epidemiology of dysphoria and depression in an elderly population. Am J Psychiatry 137(4):439-444.
5. Brown MN, Lapane KL, Luisi AF (2002), The management of depression in older nursing home residents. J Am Geriatric Soc 50(1):69-76.
6. Centers for Disease Control and Prevention (2002), Suicide in the United States. Available at: www.cdc.gov/ncipc/factsheets/suifacts.htm. Accessed Aug. 15.
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12. Jorm AF (1987), Sex and age differences in depression: a quantitative synthesis of published research. Aust N Z J Psychiatry 21(1):46-53.
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16. Kumar A, Bilker W, Jin Z, Udupa J (2000), Atrophy and high intensity lesions: complementary neurobiological mechanisms in late-life major depression. Neuropsychopharmacology 22(3):264-274.
17. Lavretsky H (1998), Late-life depression: risk factors, treatment, and sex differences. Clinical Geriatrics 6(3):13-30.
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25. Riley MW (1990), The gender paradox. In: Gender, Health, and Longevity: Multidisciplinary Perspectives, Ory MG, Warner HR, eds. New York: Springer, ppvii-xii.
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31. van Grootheest DS, Beekman AT, Broese van Groenou MI, Deeg DJ (1999), Sex differences in depression after widowhood. Do men suffer more? Soc Psychiatry Psychiatr Epidemiol 34(7):391-398.
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