The split between inward-looking disorders (women) and outward-looking disorders (men) is one of the most robust findings in psychiatric epidemiology. It replicates across decades, countries, and hundreds of millions of subjects.
The most comprehensive recent synthesis — a 2025 umbrella review in BMC Psychiatry covering 257 meta-analyses, 11,038 studies, and 619,013,307 participants — found:
Kayrouz et al. 2025, BMC Psychiatry
Distress in women turns disproportionately inward (mood, anxiety, self-directed harm, ideation); in men it turns disproportionately outward (substances, aggression, antisocial conduct, completed lethal acts).
| Disorder | Direction | Ratio (W:M) | Source |
|---|---|---|---|
| Major depression | Inward (F) | ~1.7:1 (12-mo) / ~2:1 (lifetime); OR 1.95 [1.88–2.03] | Kuehner 2017 |
| Any anxiety disorder | Inward (F) | ~1.7–1.9:1 | McLean et al. 2011 |
| PTSD | Inward (F) | ~2:1 (lifetime); OR 1.85 [1.25–2.65] post-trauma | Christiansen et al. 2022 |
| Anorexia | |||
| Bulimia | |||
| Binge Eating | Inward (F) | A: ~10:1 | |
| B: ~3–5:1 | |||
| BE: ~2:1 | Udo & Grilo 2018 | ||
| OCD (adults) | Inward (F) | ~1.5:1 adult; male-skewed in childhood | Kayrouz et al. 2025 |
| Borderline PD | Inward (F) | ~3:1; up to ~5:1 in recent large real-world samples | DSM-5; Skodol & Bender 2003; Sharp & Yu 2024 |
| Suicide attempts / ideation | Inward (F) | Inverse of completion ratio | Kayrouz et al. 2025 |
| Schizophrenia | Outward / psychotic (M) | ~1:1.4; men have earlier onset, more severe symptoms, worse outcomes | Christiansen et al. 2022 |
| Autism (ASD) | Outward / neurodev (M) | ~1:4 | Christiansen et al. 2022 |
| ADHD | Outward / neurodev (M) | ~1:3 child; ~1:1–2 adult | Christiansen et al. 2022 |
| Substance use disorder | Outward (M) | ~1:2 | Kayrouz et al. 2025 |
| Antisocial PD | Outward (M) | ~1:3 | Kayrouz et al. 2025 |
| Completed suicide | Outward (M) | ~1:4 | Kayrouz et al. 2025 |
ADHD and autism ratios shrink in adulthood. Childhood ratios are male-skewed ~4:1; adult ratios shrink to roughly 1:2 (ADHD approaches 1:1). The adult shrinkage is partly delayed diagnosis, partly broadening of diagnostic criteria and self-identification trends, not evidence that the underlying neurobiology is sex-balanced
Gender equity paradox. Larger sex differences in depression are found in nations with greater gender equity. The opposite of what a purely social-construction ideologies claim.
Age matters. The depression sex gap emerges in adolescence (peak OR ≈ 3.0 around ages 13–15), then narrows in adulthood.