Table 4. Logistic regression analysis for birth seasons in the normal and high immunoglobulin E (IgE) groups.

Season of birth	Normal IgE	High IgE	OR (95% CI)	p value
Spring (Feb.∼Apr.)	167 (66.3%)	85 (33.7%)	----	----
Summer (May∼July)	164 (63.6%)	94 (36.4%)	1.11 (0.77–1.61)	0.571
Autumn (Aug.∼Oct.)	130 (52.6%)	117 (47.4%)	1.82 (1.27–2.63)	0.001 **
Winter (Nov.∼Jan.)	152 (66.1%)	78 (33.9%)	1.02 (0.69–1.48)	0.936

Adjustments were made for maternal IgE. Normal IgE: IgE<100 kU/L for maternal IgE and IgE<20 kU/L for a 6-month-old child; High IgE: IgE>100 kU/L for maternal IgE and IgE>20 kU/L for a 6-month-old child.

^** p<0.01.

OR, odds ratio; CI, confidence interval.