Adjusted odds ratios for anemia according to the serum 25-hydroxyvitamin D levels.

*Adjusted for age, sex, smoking, exercise, hypertension, diabetes mellitus, cardiovascular disease, body mass index, season, laboratory findings such as ferritin, iron, total iron-binding capacity, cholesterol, triglyceride, estimated glomerular filtration rate, and daily iron intake.
†P value for trend.
Abbreviations: OR, odds ratio; CI, confidence interval.