Table 2.

Correlation between Vitamin D level (by classification or quartile) and other factors

Variable	Classificationa	Quartileb
Age	0.332*	0.335*
Male	0.233*	0.274*
BMI	0.032	0.017
TNF-α	0.028	0.018
HS-CRP	−0.007	0.006
Adiponectin	0.053	0.032
Leptin	−0.124*	−0.175*

^aVitamin D classification: normal (> 30 ng/ml), insufficiency (20–30 ng/ml), deficiency (< 20 ng/ml)

^bVitamin D (quartile): quartile1 (< 22.41 ng/ml), quartile2 (22.41–28.41 ng/ml), quartile3 (28.41–35.38 ng/ml), quartile4 (> 35.38 ng/ml)

*P < 0.05, by Spearman’s rank correlation coefficient