Fig. 2: Forest plots comparing the short-term (before 40 weeks’ postmenstrual age or at discharge) outcomes between the high-dose and low-dose vitamin D supplementation for preterm infants.

A Short-term outcomes: continuous variables. B Short-term outcomes: categorical variables. C Subgroup analysis of serum 25-hydroxyvitamin D levels according to different doses among the high-dose vitamin D supplementation group. D Subgroup analysis of categorical variables according to different doses among the high-dose vitamin D supplementation group. CI confidence interval, MD mean difference, RD risk difference; 25(OH)D 25-hydroxyvitamin D.