Neonatal and demographic details of the study population
| BPD | Non-BPD | Term controls | |
| Subjects n | 64 | 42 | 43 |
| Male (%) | 42 (66%)#,¶ | 32 (76%)# | 18 (42%) |
| Gestational age (PMA) weeks | 26.0 (25–27.5)¶ | 30 (29.1–31.0) | |
| Birth weight g | 843 (709–993)¶ | 1420 (1238–1615) | |
| Birth weight z-score | −0.15±0.82 | −0.12±0.82 | |
| Mechanical ventilation days | 15.3 (4.4–32.8)¶ | 0.0 (0.0–1.0) | |
| CPAP days | 14.5 (6.6–24.0)¶ | 0.7 (0.0–3.6) | |
| Supplemental oxygen days | 86.5 (57.5–98.0)¶ | 1 (0.0–3.0) | |
| Recent exercise symptoms+ | 29 (46%) | 15 (38%) | |
| Doctor diagnosed asthma ever | 23 (36%)¶ | 17 (44%) | |
| Current asthma medication | 4 (6%)¶ | 10 (26%) | |
| Age at test years | 10.8±0.6 | 10.9±0.6 | 10.6±0.6 |
| Height at test cm | 141 (136–146)¶ | 142 (138–148) | 145.5 (138–153) |
| Weight at test kg | 32.4 (28.5–37.6)¶ | 36.5 (30.5–41.3) | 34.7 (30.0–42.2) |
Data are presented as mean±sd, median (interquartile range) or n (%), unless otherwise stated. Note the term controls did not have any neonatal intervention or respiratory symptoms. Not all children completed every question in the symptom questionnaire. BPD: bronchopulmonary dysplasia; non-BPD: preterm children without BPD; PMA: postmenstrual age; CPAP: continuous positive airway pressure. #: p<0.05 compared with healthy term controls; ¶: p<0.05 compared with non-BPD; +: exercise symptoms included parentally reported wheeze, cough and shortness of breath during exertion.