Table 3. Univariate analysis between eczema and covariates in three age groups.

			3 month group						18 month group			36 month group
			OR		95%CI		P		OR	95%CI	P	OR	95%CI	P
Gender
	Female		reference		―		―		reference	―	―	reference	―	―
	Male		1.23		1.17–1.29		<0.001		1.09	1.05–1.14	<0.001	1.37	1.29–1.46	<0.001
Birth season
	Spring (Mar. to May)		reference		―		―		reference	―	―	reference	―	―
	Summer (Jun. to Aug.)		1.02		0.94–1.10		0.657		1.20	1.12–1.28	<0.001	1.00	0.91–1.09	0.981
	Autumn (Sep. to Nov.)		1.90		1.77–2.04		<0.001		1.54	1.45–1.65	<0.001	1.22	1.12–1.33	<0.001
	Winter (Dec. to Feb.)		1.91		1.78–2.04		<0.001		1.38	1.29–1.47	<0.001	1.14	1.05–1.25	0.003
Birth order
	First		reference		―		―		reference	―	―	reference	―	―
	Second and after		0.77		0.73–0.81		<0.001		0.90	0.86–0.94	<0.001	0.96	0.90–1.02	0.208
Paternal atopic dermatitis
	No		reference		―		―		reference	―	―	reference	―	―
	Yes		1.83		1.71–1.96		<0.001		2.33	2.18–2.48	<0.001	2.31	2.16–2.47	<0.001
Maternal atopic dermatitis
	No		reference		―		―		reference	―	―	reference	―	―
	Yes		1.70	1.61–1.81		<0.001		2.10		1.98–2.22	<0.001	2.34	2.21–2.48	<0.001
Parental allergic disease
		No	reference		―		―		reference	―	―	reference	―	―
		Yes	1.70		1.60–1.80		<0.001		2.00	1.90–2.12	<0.001	1.83	1.70–1.97	<0.001