There is inconsistent evidence concerning the association between thyroid dysfunctions and depression. Therefore, we conducted this population-based study to investigate the relationship between thyroid-stimulating hormone (TSH) and depression using the Patient Health Questionnaire-9 (PHQ-9).
Method:
We included patients (≥18 y) who received care at the Marshfield Clinic Health System and completed a TSH level and a PHQ-9 within 2 weeks, between 2015 and 2020. We used a logistic regression model adjusted for covariates to estimate the effect of TSH level on clinically relevant depression (PHQ-9 score ≥10).
Results:
Our cohort included 31,099 patients, mean age 50.9±19.5 years, 73.5% females, and 96.3% White, 39.7% of whom had clinically relevant depression. The patients with clinically relevant depression had higher TSH levels compared with those without such depression (P=0.01). In this cohort, we found that low TSH levels (