Table 3.

Vitamin D insufficiency/deficiency associated with advanced CKD stage defined as estimated GFR less than 15 mL/min/1.73 m² in the entire CKD subjects as evaluated by multiple logistic regression analysis

Serum 25-hydroxyvitamin D	Unadjusted OR	P-value	Adjusted OR	P-value
	(95%CI)		(95%CI)
≤30 ng/dL	2.15 (1.56, 2.97)	<0.001	2.19 (1.07, 4.48)	0.032
10-30 ng/dL	1.93 (1.39, 2.67)	<0.001	1.84 (0.88, 3.82)	0.104
<10 ng/dL	8.72 (5.32, 14.29)	<0.001	16.76 (4.89, 57.49)	<0.001
>30 ng/dL	Reference		Reference

Multivariate analyses were done after including variables such as age, gender, hemoglobin, serum albumin, calcium, phosphate and alkaline phosphatase. P-value versus serum 25-hydroxyvitamin D >30 ng/dL (reference).