Table 4

Association of FVC with birth weight status and other factors

Difference in FVC (ml)95% CI of differencep value
*Adjusted for birth weight status, sex, weight and length at test, postnatal age, maternal smoking, maternal social class, maternal height, and family history of asthma.
Univariate analyses
Birth weight status (baseline: appropriate birth weight for gestation)−24.0−32.7 to −15.3<0.001
Sex (baseline: female)1.3−7.8 to 10.40.78
Weight at test (per kg)26.822.2 to 31.4<0.001
Length at test (per cm)8.67.5 to 9.8<0.001
Postnatal age (per week)9.27.5 to 10.9<0.001
Maternal smoking (baseline: no maternal smoking)−8.2−17.4 to 1.00.08
Maternal social class (baseline: non-manual occupation)−20.2−31.0 to −9.5<0.001
Maternal height (per cm)1.10.5 to 1.80.001
Family history of asthma (baseline: no history of asthma)−5.5−15.6 to 4.60.28
Multivariate analysis*
Birth weight status (baseline: appropriate birth weight for gestation)−11.6−19.4 to −3.80.004
Sex (baseline: female)−5.9−12.5 to 0.70.08
Weight at test (per kg)−2.3−10.2 to 5.60.57
Length at test (per cm)6.03.7 to 8.3<0.001
Postnatal age (per week)4.43.7 to 8.3<0.001
Maternal smoking (baseline: no maternal smoking)−2.0−8.7 to 4.60.54
Maternal social class (baseline: non-manual occupation)−3.1−11.3 to 5.20.46
Maternal height (per cm)0.2−0.3 to 0.80.34
Family history of asthma (baseline: no history of asthma)−2.7−9.6 to 4.30.45