Table 2.

Univariate logistic regression models for an outcome of an allergy vs. no allergy.

Variable	Odds ratio (95% CI)	P value
Head circumference at mid-gestation per 1-mm increase	0.96 (0.92, 0.997)	0.037
Pre-eclampsia (N vs. Y)	0.85 (0.50, 1.47)	0.56
Nulliparity (N vs. Y)	1.14 (0.67, 1.95)	0.64
Gender (F vs. M)	0.99 (0.58, 1.69)	0.96
Cesarian delivery (N vs. Y)	1.28 (0.74, 2.21)	0.38
Smoking (N vs. Y)	1.16 (0.45, 2.99)	0.76
Maternal age per year increase	0.98 (0.93, 1.02)	0.34
Maternal BMI per unit increase	0.99 (0.95, 1.03)	0.58