Association of FVC with birth weight status and other factors
| Difference in FVC (ml) | 95% CI of difference | p 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 10.4 | 0.78 |
| Weight at test (per kg) | 26.8 | 22.2 to 31.4 | <0.001 |
| Length at test (per cm) | 8.6 | 7.5 to 9.8 | <0.001 |
| Postnatal age (per week) | 9.2 | 7.5 to 10.9 | <0.001 |
| Maternal smoking (baseline: no maternal smoking) | −8.2 | −17.4 to 1.0 | 0.08 |
| Maternal social class (baseline: non-manual occupation) | −20.2 | −31.0 to −9.5 | <0.001 |
| Maternal height (per cm) | 1.1 | 0.5 to 1.8 | 0.001 |
| Family history of asthma (baseline: no history of asthma) | −5.5 | −15.6 to 4.6 | 0.28 |
| Multivariate analysis* | |||
| Birth weight status (baseline: appropriate birth weight for gestation) | −11.6 | −19.4 to −3.8 | 0.004 |
| Sex (baseline: female) | −5.9 | −12.5 to 0.7 | 0.08 |
| Weight at test (per kg) | −2.3 | −10.2 to 5.6 | 0.57 |
| Length at test (per cm) | 6.0 | 3.7 to 8.3 | <0.001 |
| Postnatal age (per week) | 4.4 | 3.7 to 8.3 | <0.001 |
| Maternal smoking (baseline: no maternal smoking) | −2.0 | −8.7 to 4.6 | 0.54 |
| Maternal social class (baseline: non-manual occupation) | −3.1 | −11.3 to 5.2 | 0.46 |
| Maternal height (per cm) | 0.2 | −0.3 to 0.8 | 0.34 |
| Family history of asthma (baseline: no history of asthma) | −2.7 | −9.6 to 4.3 | 0.45 |