LFT follow up at 18 m cPNA
| Crs | V'max FRC | FVC | FEV0.5 | FEF25-75% | |
| N (term/preterm infants)* | 33/33 | 55/50 | 52/42 | 52/42 | 52/42 |
| Term: z-score [mean (SD)] | 0.20 (0.28) | 0.83 (0.97) | -0.41 (1.17) | -0.25 (1.01) | 0.14 (0.83) |
| Preterm: z-score [mean (SD)] | 0.23 (0.35) | 0.89 (1.23) | -0.25 (1.18) | -0.17 (0.91) | 0.21 (0.87) |
| 95% CI (preterm-term) P value | -0.18;0.12 (0.72) | -0.49;0.37 (0.77) | -0.64;0.33 (0.52) | -0.48;0.31 (0.67) | -0.42;0.28 (0.70) |
| *not all tests were performed in all infants |