Birth characteristics of subjects with and without asthma in a sample of Danish twin pairs, 3–9 years of age
| Measure | Asthma | |||
| Yes n=1155 | No n=9618 | Difference (95% CI) | p Value | |
| Birth weight | 2467 | 2589 | 122 (87 to 158) | <0.001 |
| Birth length | 47.54 | 48.14 | 0.60 (0.39 to 0.81) | <0.001 |
| Birth BMI | 10.93 | 11.17 | 0.23 (0.14 to 0.32) | <0.001 |
| Gestational age | 250.50 | 255.02 | 4.52 (3.32 to 5.72) | <0.001 |
| Apgar score | 9.69 | 9.74 | 0.05 (−0.01 to 0.11) | 0.120 |
| Current age | 6.23 | 5.83 | 0.41 (0.29 to 0.53) | <0.001 |
| Sex | ||||
| Males | 12.7 | 87.3 | 1.00 | |
| Females | 8.7 | 91.3 | 0.65 (0.58 to 0.74) | <0.001 |
| Zygosity | ||||
| MZ | 11.8 | 88.2 | 1.00 | |
| DZ | 10.7 | 89.3 | 0.90 (0.77 to 1.05) | 0.183 |
Measures are mean values except for sex and zygosity (prevalence). Birth weight is in g, birth length is in cm, BMI is in kg/m2, gestational age is in days, current age is years.
Means and proportions are calculated from available data for the individual variables.
Sex and zygosity difference are ORs.
BMI, body mass index; DZ, dizygosity; MZ, monozygosity.