Baseline Characteristics of Participants in the Full Factorial Component of the Vitamin D/Calcium Polyp Prevention Study, by Calcium Treatment Group (N = 1,675).

Data are means ± SD or number of participants (% of total).1Includes placebo and vitamin D treatment arms.2Includes calcium and calcium plus vitamin D treatment arms.3Taking a calcium supplement separate from a multivitamin.4Estimated glomerular filtration rate (eGFR) calculated using the CKD-EPI equation [18].5Includes use of loop, thiazide, and K+-sparing diuretics.6Participant self-report of diabetes diagnosis or use of medication(s) for diabetes.Number of participants with missing data: Hispanic ethnicity 3 (1 placebo, 2 calcium); BMI 1 (placebo); alcohol 11 (5 placebo, 6 calcium); taking multivitamin 2 (calcium); taking calcium supplement 3 (1 placebo, 2 calcium); dietary calcium and vitamin D 129 (64 placebo, 65 calcium); diabetes 1 (placebo).Baseline Characteristics of Participants in the Full Factorial Component of the Vitamin D/Calcium Polyp Prevention Study, by Calcium Treatment Group (N = 1,675).