Main Outcomes and Measures
SE
Multivariable-adjusted means (SE) or 95% CIs of vitamin D–related serum biomarkers at baseline and follow-up: total 25-hydroxyvitamin D (25-OHD), 25-OHD3, free vitamin D (FVD), bioavailable vitamin D (BioD), vitamin D–binding protein (VDBP), albumin, parathyroid hormone (PTH), and calcium, and log-transformed as needed.