Statistical Analysis
SECONDARY
Longitudinal secondary data analyses followed the intention-to-treat principle; 2-tailed independent-sample To test the potential interaction between prenatal 25(OH)D level and supplementation degree, children were grouped by maternal pregnancy 25(OH)D level. A 30-ng/mL cutoff point was selected a priori based on previous studies.Analyses were conducted with sexes combined. Additional information on study characteristics stratified by sex and sex × intervention group interaction analysis is given in the eAppendix and eTables 3 and 4 in 