| BPD | Non-BPD | Full-term | BPD versus non-BPD unadjusted OR (95% CI) | BPD versus non-BPD adjusted OR (95% CI)# | BPD versus full-term unadjusted OR (95% CI) | BPD versus full-term adjusted OR (95% CI)¶ | |
| Subjects n | 72 | 57 | 78 | ||||
| Item 1: wheeze? | 34 (47) | 19 (33) | 24 (31) | 1.79 (0.87–3.67) | 2.86 (1.14–7.16)* | 2.01 (1.03–3.92)* | 2.29 (1.14–4.59)* |
| Item 1.1: wheeze and breathless? | 19 (26) | 13 (23) | 13 (17) | 1.21 (0.54–2.73) | 1.16 (0.44–3.06) | 1.79 (0.81–3.96) | 2.23 (0.96–5.16) |
| Item 1.2: wheeze when did not have a cold? | 23 (32) | 14 (25) | 13 (17) | 1.44 (0.66–3.15) | 1.89 (0.70–5.14) | 2.35 (1.08–5.09)* | 2.61 (1.17–5.82)* |
| Item 2: woken with tightness in chest? | 20 (28) | 12 (21) | 12 (15) | 1.44 (0.64–3.27) | 2.09 (0.73–5.96) | 2.12 (0.95–4.72) | 2.64 (1.13–6.19) |
| Item 3: shortness of breath | 11 (15) | 9 (16) | 3 (4) | 0.96 (0.37–2.51) | 0.86 (0.26–2.85) | 4.51 (1.20–16.89)* | 4.93 (1.27–19.10)* |
| Item 4: coughing | 24 (34) | 16 (28) | 16 (21) | 1.31 (0.61–2.79) | 1.37 (0.53–3.55) | 1.98 (0.95–4.14) | 2.17 (1.01–4.67)* |
| Item 5: attack of asthma | 7 (10) | 6 (11) | 1 (1) | 0.92 (0.29–2.89) | 0.41 (0.07–2.38) | 8.29 (0.99–69.16) | 8.90 (1.04–76.25)* |
| Item 6: use asthma medication | 19 (26) | 13 (23) | 7 (9) | 1.21 (0.54–2.73) | 1.68 (0.60–4.71) | 3.64 (1.43–9.38)** | 3.78 (1.45–9.88)** |
| Item 7: nasal allergies | 22 (31) | 17 (30) | 28 (36) | 1.04 (0.49–2.21) | 1.23 (0.46–3.25) | 0.79 (0.40–1.55) | 0.83 (0.41–1.67) |
| Symptomatic ECRHS score | 22 (31) | 18 (32) | 10 (13) | 0.95 (0.45–2.02) | 1.27 (0.50–3.20) | 2.99 (1.30–6.88)** | 3.03 (1.29–7.12)* |
| Physician diagnosis of asthma | 29 (40) | 22 (39) | 11 (14) | 1.07 (0.53–2.19) | 1.17 (0.50–2.70) | 4.11 (1.86–9.08)* | 4.30 (1.91–9.72)*** |
Data are presented as n (%), unless otherwise stated. #: adjusted for female sex, maternal smoking and having ever smoked; ¶: adjusted for female sex and having ever smoked. *: p<0.05; **: p<0.01; ***: p<0.001 between BPD and full-term groups only.