Summary: A large meta-analysis finds that gender differences in depression — both in diagnoses and reported symptoms — appear by age 12 and peak during adolescence.

Source: University of Wisconsin–Madison

Gender Differences in Depression Emerge by Age 12, Large Meta-Analysis Finds

A comprehensive analysis of existing studies covering more than 3.5 million people in over 90 countries has confirmed a substantial gender gap in depression. The meta-analysis, published in Psychological Bulletin, found that females are diagnosed with major depression at roughly twice the rate of males overall. The pattern emerges earlier than previously reported, appearing by age 12 and reaching its peak during adolescence.

Lead and co-authors of the study — Janet Hyde (University of Wisconsin–Madison), Rachel Salk, and Lyn Abramson — examined nationally representative data from both diagnostic assessments and self-reported symptom measures. Their results show a clear and consistent gender disparity across nations and ages, while also underscoring that a significant portion of people with depression are male.

“Across the studies we reviewed, roughly twice as many women as men were diagnosed with major depression,” says Janet Hyde. “Although that ratio has been reported before, the current meta-analysis rests on far stronger and broader evidence. Still, it is important not to reduce depression to a ‘women’s disorder’: about one-third of those affected are men.”

The analysis indicates that the gender gap in depression is already present at age 12. Earlier studies typically placed the emergence of the gender difference in early to mid-adolescence (ages 13–15), but the larger and more representative data sets used here show the difference beginning slightly earlier. The disparity increases through mid-adolescence, then declines somewhat, remaining elevated in adulthood.

Image shows a depressed looking young girl. — Puberty, which commonly begins around age 12 for girls, could contribute to the earlier onset. Image used for illustration only.

Pubertal changes are a likely contributor to the early rise in female depression, the researchers note. Biological factors such as hormonal shifts coincide with social changes: girls at that age often encounter greater sexual attention or harassment and different social expectations. The available data cannot determine the relative contribution of biological and social factors, but both are plausible contributors.

Because the available data did not cover children younger than 12, the authors emphasize that developmental processes occurring around ages 11–12 deserve attention from clinicians, educators, and policymakers. “If prevention is the goal, interventions should begin before age 12,” Hyde says. “Depression is often treatable, and early support can reduce suffering and the risks of related health problems.”

The study separated diagnostic measures of major depression — which require rigorous clinical criteria — from symptom measures that rely on self-report items such as “I feel blue most of the time.” Both kinds of measures showed a female disadvantage, although patterns and moderators differed between diagnostic and symptom-based results.

One surprising cross-national finding was that greater gender equity in a nation’s social and economic conditions was associated with larger gender differences in diagnosed major depression. In other words, in countries with higher measures of gender equity, women were diagnosed with major depression at relatively higher rates compared with men. The authors suggest possible explanations, including differences in social comparison or in how depressive feelings are expressed across genders; however, this relationship did not appear for self-reported depressive symptoms.

Key findings and implications

A pooled analysis of more than 3.5 million people from over 90 countries confirms a consistent gender gap in depression.
For major depression diagnoses, the overall odds ratio was about 1.95, indicating nearly twice the likelihood for females compared to males.
The gender difference in diagnoses was already significant at age 12 (OR ≈ 2.37), peaked in early to mid-adolescence (OR ≈ 3.02 for ages 13–15), and declined into adulthood but remained elevated.
Self-reported symptom measures also showed a gender difference (d ≈ 0.27 overall; d ≈ 0.47 around age 16), but patterns across nations differed from diagnostic data.
The gender disparity represents a public health concern, especially during adolescence, yet the magnitude underscores that depression in males remains a substantial issue that should not be overlooked.

About this research

The meta-analysis combined data from 65 articles and national data sets for major depression diagnoses (total N ≈ 1,716,195) and 95 articles and national data sets for depression symptoms (total N ≈ 1,922,064), representing over 90 nations. Full citation: “Gender Differences in Depression in Representative National Samples: Meta-Analyses of Diagnoses and Symptoms” by Rachel H. Salk, Janet S. Hyde, and Lyn Y. Abramson, published in Psychological Bulletin, online April 27, 2017 (doi:10.1037/bul0000102).

Image source: Illustrative image used for the article; image credited as public domain where applicable.