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

Table 3

Logistic regression for presumed risk factors for vitamin D deficiency (25(OH)D < 20 ng/mL).

		SE	OR	95% CI for OR
				Lower	Upper
Gender; Male versus female	2.331	1.024	10.291	1.382	76.610	0.023
BMI; Normal versus obese	0.783	1.073	2.188	0.267	17.934	0.466
Mother education; Postsecondary versus secondary school or less	3.096	1.137	22.112	2.380	205.476	0.006
Physical activity; High (≥4 hours/week) versus; low (<4 hours/week)	1.516	0.805	4.552	0.940	22.043	0.060
Fortified milk intake; Once or more/day versus; less than once/day	1.212	0.562	3.360	1.116	10.114	0.031
Sun exposure; Hours/week	−0.131	0.216	0.877	0.574	1.339	0.543
Serum calcium	0.512	0.482	1.668	0.649	4.291	0.288
Serum phosphorus	−0.460	0.213	0.631	0.416	0.959	0.031
PTH	0.058	0.018	1.060	1.023	1.099	0.001

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