ArticlePeerJ2026
Thyroid function and depression among adolescents: a cross-sectional study exploring sex-based differences.
Article in PeerJ, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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12 authors.
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Abstract
Background: The role of thyroid hormones and their interaction with sex hormones in adolescent major depressive disorder (MDD), particularly regarding sex differences, remains poorly understood. Methods: This cross-sectional study included first-episode adolescent depression outpatients. All patients were stratified by depression severity into non-major depression disorder (non-MDD) and MDD groups. Serum levels of thyroid and sex hormones (testosterone, estradiol, progesterone) were measured. Group comparisons, correlation analyses, multivariate logistic regression, and moderation analysis were performed. Results: The study included 837 patients (597 females and 240 males), comprising 359 non-MDD and 478 MDD cases. The mean age was 15 years (IQR 14-16). Compared to males, females exhibited higher SDS (Z = -7.34, Conclusions: Thyroid dysfunction is associated with adolescent MDD in a sex-specific manner. A logistic regression model incorporating both thyroid and sex hormones showed improved classification accuracy. Importantly, testosterone was found to moderate the relationship between T3 and depression severity. These findings suggest that assessing thyroid function alongside sex hormone levels may enhance risk stratification in adolescent MDD.
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