Fig. 3

The association between high-density lipoprotein cholesterol and serum 25-hydroxyvitamin D. The solid red line represents the smooth curve fit between variables. The blue bands represent the 95% confidence interval from the fit. Age, gender, race, education level, BMI, having smoked at least 100 cigarettes in a lifetime, alcohol consumption, moderate activities, diabetes status, hypertension status, total calcium, serum phosphorus, ALT, AST, uric acid, creatinine, and blood urea nitrogen were adjusted