There was a marked dose-dependent increase in the average serum 25(OH)D concentration in the three study groups, from 55.3 to 59.0 nmol/L, from 57.7 to 85.4 nmol/L, and from 58.1 to 103.1 nmol/L, in the placebo, 40 μg/d, and 80 μg/d groups, respectively (mean ranks for change 17.1, 35.4, and 47.8, resp., P < 0.001; see Table 2).
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