Risk ^a for insulin resistance ^b at follow up among participants without baseline insulin resistance.

25(OH)D, 25-hydroxyvitamin D; OR (95% CI), odds ratio with 95% confidence interval; # visits, numbers of follow up visits; nmol/L, nanomoles per liter. a The analyses were adjusted for the variables included in the table, and additionally adjusted for gender, baseline body mass index, age, hypertension, serum low-density lipoprotein cholesterol, season at baseline, season at follow up, tobacco smoking status, alcohol drinking status, and physical activity at baseline, physical activity change during follow up b Insulin resistance was defined as HOMA-IR ≥ 2.73. Risk a for insulin resistance b at follow up among participants without baseline insulin resistance.