Predictors of Serum 25-Hydroxyvitamin D Concentrations among a Sample of Egyptian Schoolchildren

Table 4

Logistic regression for presumed risk factors for vitamin D insufficiency (25(OH)D 20–29.9 ng/mL).

		SE	OR	95% CI for OR
				Lower	Upper
Gender; Male versus female	1.050	0.574	2.859	0.927	8.814	0.068
BMI; Normal versus obese	1.630	0.790	5.103	1.084	24.013	0.039
Mother education; Postsecondary versus secondary school or less	2.785	0.705	16.194	4.064	64.530	<0.001
Physical activity; High (≥4 hours/week) versus; low (<4 hours/week)	1.270	0.556	3.561	1.198	10.582	0.022
Fortified milk intake; Once or more/day versus less than once/day	0.185	0.447	1.203	0.501	2.890	0.679
Sun exposure; Hours/week	−0.538	0.207	0.584	0.389	0.877	0.009
Serum calcium	0.064	0.406	1.066	0.481	2.364	0.875
Serum phosphorus	−0.500	0.160	0.606	0.443	0.829	0.002
PTH	0.050	0.014	1.051	1.024	1.080	<0.001

⁢ is significant.
BMI: body mass index, OR: odds ratio.
PTH: parathyroid hormone, CI: confidence interval.