The Association Between Thyrotropin and Clinically Relevant Depression: A Retrospective Cross-Sectional Study

Area of Science:

• Endocrinology
• Psychiatry
• Clinical Research

Background:

• Thyroid dysfunction and mood disorders significantly impact patient quality of life.
• Understanding the relationship between thyroid function and depression is crucial for comprehensive patient care.

Purpose of the Study:

• To investigate the association between thyrotropin (TSH) levels and clinically relevant depression (CRD).
• To examine this association in a population-based sample of adults with and without diagnosed mood disorders.

Main Methods:

• Retrospective cross-sectional study of 33,138 adult patients with TSH and PHQ-9 data.
• Data included demographics, diagnoses, thyroid function, and mood disorder indicators.
• Logistic regression models adjusted for covariates to assess the TSH-CRD association.

Main Results:

• Nearly half of the patients had diagnosed mood disorders, and almost half experienced CRD (PHQ-9 ≥ 10).
• Elevated TSH levels showed a significant association with increased odds of CRD (OR=1.01).
• Both low TSH (OR=1.19) and high TSH (OR=1.26) groups had significantly increased odds of CRD.

Conclusions:

• Thyroid dysfunction, indicated by abnormal TSH levels, is associated with an increased risk of depression.
• Abnormal thyroid function may contribute to the development or exacerbation of depressive symptoms.
• Further longitudinal studies are recommended to explore the causal relationship between thyroid function and incident depression.