Figure 2. Adjusted Hazard Ratios (HRs) of Fecundability and Adjusted Odds Ratios (ORs) of Spontaneous Abortion According to Preconception Thyrotropin Levels.

NA indicates not applicable.

^aCox proportional hazard regression model was adjusted for maternal age at last menstrual period, body mass index, education, area of residence, alcohol drinking, smoking, passive smoking, hypertension, diabetes, history of thyroid disease, reproductive tract infections, hepatitis B virus surface antigen positive status, maternal age at menarche, menstrual cycle length, and menstrual period length.

^bLogistic regression model was adjusted for maternal age at last menstrual period, body mass index, education, area of residence, alcohol drinking, smoking, passive smoking, hypertension, diabetes, history of thyroid disease, and history of adverse pregnancy outcomes.