FIGURE 2.

Changes in serum 25-hydroxyvitamin D concentrations in older adults who received daily supplements containing cholecalciferol, calcium, both, or placebo. Values shown are the proportions achieving deficient, inadequate, or adequate status after 1 y in each of 4 baseline categories: 1) inadequate vitamin D status randomly assigned to placebo (n = 194), 2) inadequate vitamin D status randomly assigned to cholecalciferol (n = 181), 3) adequate vitamin D status randomly assigned to placebo (n = 267), and 4) adequate vitamin D status randomly assigned to cholecalciferol (n = 279). Individuals were excluded from analysis if they were vitamin D–deficient at baseline, had been taking vitamin D supplements before enrollment, or took personal vitamin D supplements during year 1. All measures are unadjusted.