Maternal characteristics for the entire cohort
| Subjects n | 189 |
| Maternal age years | 26.1±5.5 |
| BMI kg·m−2 | 28.4±7.2 |
| BMI category | |
| Normal weight | 76 (40.2) |
| Overweight | 46 (24.3) |
| Obese | 67 (35.4) |
| Weight gain during pregnancy kg | 10.7±6.5 |
| Socioeconomic status | |
| 1 (Lowest) | 100 (52.9) |
| 2 | 61 (32.3) |
| 3 | 6 (3.2) |
| 4 | 12 (6.3) |
| 5 (Highest) | 10 (5.3) |
| Ethnicity | |
| Caucasian | 176 (93.1) |
| Other | 13 (6.9) |
| Parity | |
| ≥1 | 111 (58.7) |
| Smoking status | |
| Never/former smoker | 128 (67.7) |
| Quit smoking during pregnancy | 23 (12.2) |
| Current smoker | 38 (20.1) |
| Baseline ICS use | |
| Yes | 61 (32.3) |
| No | 128 (67.7) |
| Baseline ICS type | |
| ICS | 13 (21.3) |
| ICS + LABA | 48 (78.7) |
| Spirometry | |
| FEV1 L | 3.02±0.43 |
| FEV1 % pred | 92±11 |
| FVC L | 3.70±0.56 |
| FEV1/FVC | 0.82±0.06 |
| New ICS in pregnancy | |
| No | 102 (54) |
| Yes | 26 (13.8) |
| Using ICS pre-pregnancy | 61 (32.3) |
| Any severe exacerbation | 41 (21.7) |
| OCS use | 14 (7.4) |
| General practitioner visit | 31 (16.4) |
| Emergency department visit | 10 (5.3) |
| Admitted to hospital | 2 (1.1) |
| Persistent uncontrolled asthma | 30 (15.9) |
Data are presented as mean±sd or n (%), unless otherwise stated. BMI: body mass index; ICS: inhaled corticosteroid; LABA: long-acting β2-agonist; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; OCS: oral corticosteroid.