Subgroup analyses of the association between baseline and time-dependent hypothyroidism and all-cause mortality (reference group: euthyroidism). Analyses were adjusted for covariates in model 2: entry calendar quarter, age, sex, race/ethnicity, cause of ESRD, vascular access, dialysis vintage, BMI, diabetes, CHF, cerebrovascular disease, MI, other cardiac disease, hypertension, and PVD. Error bars represent 95% CIs.