What type of study is this?

This is a Meta-Analysis study (also classified as: Systematic Review).

Could thyrotropin serum level characterize major depressive disorder phenotype? A systematic review and meta-analysis

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Systematic review reveals higher thyrotropin levels linked to increased suicide attempt risk in MDD patients, suggesting a potential biomarker.

Higher thyrotropin levels are associated with an increased risk of suicide attempts among major depressive disorder patients.
In a meta-analysis of 6,224 participants, standardized mean difference of 1.848 mIU/L shows significant findings.
Analysis followed PRISMA guidelines and assessed study quality with QUADAS-2, including 45 qualitative and 18 quantitative studies.
Conflicting data exist regarding thyrotropin levels in first episode drug-naïve patients compared to healthy subjects.

Gatta et al. (2025) studied this question.

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Systematic review reveals higher thyrotropin levels linked to increased suicide attempt risk in MDD patients, suggesting a potential biomarker.