Table 2.

Correlation between serum vitamin D (25(OH)D) concentration and different predictive variables.

Variable		Concentration of 25 (OH)D (ng/mL)
Age (years)	r	0.074
	p	0.299
BMI	r	−0.636
	p	<0.001∗
Hours of sun exposure/week	r	0.665
	p	<0.001∗
Serum calcium (mg/dL)	r	−0.278
	p	<0.001∗
Serum phosphorus (mg/dL)	r	−0.156
	p	0.028∗
PTH (pg/mL)	r	−0.577
	p	<0.001∗

   ^∗ p < 0.05 is significant.

BMI: body mass index.

PTH: parathyroid hormone.