Background variables for 83 subjects born extremely preterm with and without neonatal bronchopulmonary dysplasia (BPD) and 81 term-born control subjects
| 1991–1992 cohort | 1982–1985 cohort | ||||
|---|---|---|---|---|---|
| Mean (SD) age (years) | 10.5 (0.4) | 17.8 (0.4) | 17.7 (1.2) | 24.9 (1.2) | |
| Total N | Control | 35 | 29 | 46 | 40 |
| Preterm | 35 | 31 | 46 | 43 | |
| Maternal smoking in pregnancy | Control | 9 (26) | – | 10 (22) | – |
| Preterm | 13 (37) | – | 22 (48)* | – | |
| Current self-reported smoking | Control | – | 5 (17) | 14 (30) | 8 (20) |
| Preterm | – | 1 (3) | 15 (33) | 17 (40) | |
| Allergy† | Control | 8 (23) | – | 20 (44) | – |
| Preterm | 9 (26) | – | 13 (28) | – | |
| Wheeze last 12 months | Control | 2 (6) | 10 (34) | 12 (27) | 8 (20) |
| Preterm | 11 (31)* | 12 (39) | 16 (35) | 18 (42) | |
| Asthma medication last 12 months | Control | 1 (3) | 1 (3) | 1 (2) | 3 (8) |
| Preterm | 5 (14) | 7 (23) | 7 (16) | 5 (12) | |
| Current asthma‡ | Control | 1 (3) | 5 (17) | 3 (7) | 3 (8) |
| Preterm | 10 (29)** | 6 (19) | 8 (17) | 8 (19) | |
Data shown are n (%).
*p<0.05 and **p<0.01, preterm vs term-born control subjects within the same birth cohort (Pearson exact χ2 test).
†Allergy denotes hypersensitivity to at least one tested allergen (at least one positive skin prick or specific serum IgE test).
‡A combination of wheeze in last 12 months plus either ‘asthma ever’ or asthma medication in last 12 months.