Table 1: Characteristics of subjects with and without atopic dermatitis in a sample of Danish twin pairs, 3–9 years of age.

Atopic dermatitisOR (95% CI) value
Yes
No

Birth weight, g2593257122 (−9–52)0.167
Birth length, cm48.2448.050.19 (0.01–0.38)0.038
Apgar score9.769.730.03 (−0.02–0.09)0.172
Gestational age, days254.9254.60.32 (−0.61–1.26)0.496
Caesarean section14.415.30.93 (0.84–1.04)0.220
Maternal smoking12.915.50.80 (0.70–0.92)0.002
Sex
 Boys14.086.01.00
 Girls16.084.01.17 (1.05–1.30)0.003
Age, years5.925.860.06 (−0.05–0.17)0.257
Zygosity
 DZ14.485.61.00
 MZ16.883.21.20 (1.04–1.38)0.012

Means and proportions are calculated from available data for the individual variables.
OR is mean difference for birth weight, birth length, Apgar score, gestational age, and age.