Among the 93 716 women in the total cohort, 7846 (8.4%) were currently using statin medication at baseline; 1844 (2%) had used their current statin medication for more than 3 years, 3416 (3.6%) for 1 to 3 years, and 2586 (2.8%) for less than 1 year. The prevalence rates of use of statin agents were simvastatin (2.6%), lovastatin (2.1%), pravastatin (1.9%), fluvastatin (1.0%), and atorvastatin (0.8%). According to potency classification, 2526 women (3.1%) used a low-potency statin, 1516 (1.9%) used a medium-potency statin, and 2720 (3.3%) used a high-potency statin. Women currently using statin medication at baseline were older than nonusers (mean age, 65.8 years vs. 63.4 years, respectively), had higher body mass index (28.4 kg/m2 vs. 27.2 kg/m2, respectively), and were more likely to have a history of myocardial infarction or angina (Table 1). Concurrent use of thiazide diuretics was also more common among statin users. Hormone replacement therapy was used slightly less often among statin users than nonusers (40.4% vs. 46.0%, respectively). Among current hormone users, the duration of hormone use was similar for statin users (8.4 years) and nonusers (8.3 years). Other baseline characteristics were similar for statin users and nonusers, including race or ethnicity, history of fracture, alcohol consumption, smoking, time spent walking, and total daily calcium intake (Table 1). Although the differences by statin use were small, many of these comparisons were nonetheless statistically different because of the large number of women in the cohort.