question: Compared to the placebo group receiving an equivalent number of identical placebo capsules, which were continued daily for a period of 16 weeks what was the result of vitamin D group receiving an initial bolus dose of 100,000 IU (in 2 capsules) followed by 4,000 IU (in 4 capsules) of cholecalciferol daily on Serum 25(OH)D concentrations?
context: Serum 25(OH)D concentrations increased with vitamin D supplementation compared to placebo (p < 0.001).