Biomarkers of Calcium and Bone Metabolism of Infant Groups Over Time
REGRESSION
Data are reported as means with SDs and were analyzed using a linear mixed-effects regression model for group-by-time interaction and time; the model included participant-level random intercepts and slopes for time. Post hoc testing showed no differences between trial groups over time. The 1000 IU per day group and 400 IU per day group were adjusted for multiple comparisons except for time, which was significant for all comparisons. The shaded areas correspond to the reference group SDs. CTX-I indicates urinary alpha telopeptide of type 1 collagen; P1NP, procollagen type 1 N-terminal propeptide; PTH, parathyroid hormone.