| V'maxFRC | FVC | FEV0,5 | FEF25-75 | |
| n (term/preterm)* | 48/51 | 37/43 | 37/43 | 37/43 |
| Term z-score; mean (SD) | 0.04 (0.89) | 0.10 (1.08) | -0.22 (1.02) | -0.29 (0.99) |
| Preterm z-score; mean (SD) | -0.49 (0.88) | -0.25 (1.15) | -0.78 (1.22 | -0.82 (1.21) |
| 95% CI (preterm-term); P value | -0.90; -0.21 (P=0.004) | -0.90; 0.08 (P=0.163) | -1.11; -0.11 (P=0.032) | -1.00; -0.02; (P=0.037) |
*not all tests were performed in all infants