Abstract

BackgroundSubclinical hypothyroidism (SCH) is highly correlated with major depressive disorder (MDD). However, the prevalence and risk factors for SCH in older patients with MDD have rarely been reported in China.MethodsThis cross-sectional study included 266 older MDD patients with SCH was performed. Clinical and anthropometric, biochemical, and thyroid function data were collected. Depression, anxiety, and psychotic symptoms were assessed using the Hamilton Depression Scale, the Hamilton Anxiety Scale, and the Positive and Negative Syndrome Scale positive subscale, respectively.ResultsAmong older patients with MDD, the prevalence of SCH was 64.7% (172/266). Compared to patients without SCH, older MDD patients with SCH had a longer disease course and higher TSH, A-TG, A-TPO, HDL-C, LDL-C, TC, FPG, and systolic pressure levels (all P ≤ 0.002). Furthermore, disease progression (OR 1.082, 95% CI 1.020–1.147, P = 0.009), A-TG (OR 1.005, 95% CI 1.001–1.009, P = 0.017), TC (OR 2.024, 95% CI 1.213–3.377, P = 0.007), FPG (OR 2.916, 95% CI 1.637–5.194, P < 0.001), systolic pressure (OR 1.053, 95% CI 1.008–1.100, P = 0.022) were independently associated with SCH, in older patients with MDD.ConclusionsOur findings suggest a high prevalence of SCH in older patients with MDD. Several demographic and clinical variables were independently associated with SCH in older patients with MDD.

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