| EP | Early preterm |
| TC | Term healthy |
| LP | Late preterm |
| FEV1 | Forced expiratory volume in one second |
| CPET | Cardiopulmonary exercise test |
| V̇O2 | Oxygen uptake |
| BPD | Bronchopulmonary dysplasia |
| PFT | Pulmonary function tests |
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