Fig. 2From: Dose and time responses of vitamin D biomarkers to monthly vitamin D3 supplementation in overweight/obese African Americans with suboptimal vitamin d status: a placebo controlled randomized clinical trialDose- and time-responses of 25(OH)D. Intention-to-treat mixed-model repeated-measures analysis of variance of the effect of group on serum 25-hydroxyvitamin D [25(OH)D], the P-value in each panel indicates the test of the dose–response trend. Error bars indicate 95 % confidence intervalsBack to article page