Binary logistic regression for neonatal and spirometry variables, for presence of expiratory flow limitation
| Variable | Odds ratio (95% CI) | p-value | R2 |
| FEV1/FVC z-score | 0.184 (0.084–0.401)* | <0.001 | 0.477 |
| Gestational age (PMA) | 0.799 (0.640–0.997)* | 0.047 | |
| Supplemental oxygen days | 1.22 (0.674–2.200) | 0.514 |
FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; PMA: postmenstrual age. *: p<0.05.