Endpoints The primary efficacy endpoints were the proportion of patients with mean Hb ≥10 g/dL, averaged over weeks 16–24, and the mean Hb change from baseline to the average over weeks 16–24. Pre-specified subgroup analyses were performed by sex, age group, race, baseline Hb categories, baseline iron status, cardiovascular/cerebrovascular/thromboembolic medical history, starting dose, participating dialysis organizations, and baseline ESA dose category.