Odds ratios of maternal asthma exacerbations on adverse perinatal outcomes
| No exacerbation | Exacerbation | OR (95% CI) | aOR# (95% CI) | |
| Subjects n | 32 399 | 1430 | ||
| Birthweight categories | ||||
| ≤2499 g | 1180 (3.6) | 60 (4.2) | 1.21 (0.92–1.59) | 1.02 (0.75–1.39) |
| 2500–2999 g | 3601 (11.1) | 224 (15.7) | 1.48 (1.27–1.72) | 1.45 (1.24–1.70) |
| 3000–3999 g¶ | 21 595 (66.7) | 909 (63.7) | Ref. | Ref. |
| ≥4000 g | 5965 (18.4) | 235 (16.5) | 0.94 (0.81–1.09) | 0.94 (0.80–1.10) |
| Missing | 58 (0.2) | 2 (0.1) | ||
| Preterm birth | ||||
| Yes | 1834 (5.7) | 85 (5.9) | 1.05 (0.84–1.32) | 1.00 (0.79–1.28) |
| Missing | 13 (0.04) | 2 (0.1) | ||
| Small for gestational age | ||||
| Yes | 856 (2.6) | 52 (3.6) | 1.39 (1.05–1.85) | 1.28 (0.94–1.75) |
| Missing | 72 (0.2) | 3 (0.2) | ||
| Mode of delivery | ||||
| Vaginal/instrumental | 25 809 (79.7) | 1046 (73.1) | Ref. | Ref. |
| Elective caesarean section | 2807 (8.7) | 170 (11.2) | 1.49 (1.26–1.77) | 1.49 (1.24–1.78) |
| Emergency caesarean section | 3387 (10.5) | 187 (13.1) | 1.36 (1.16–1.60) | 1.32 (1.11–1.57) |
| Unknown caesarean section | 396 (1.2) | 27 (1.9) |
Data are presented as n (%), unless otherwise stated. #: adjusted for maternal smoking, obesity, education, country of birth, parity and depression/anxiety, and infant sex; ¶: approximately mean±1sd in population.