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| Non-HPS (n = 146) | HPS (n = 72) | P value | |
| FEV1 (% predicated) | 90.52 (88.12–92.93) | 85.47 (82.22–88.72) | 0.015 |
| FVC (% predicated) | 90.58 (88.15–93.01) | 86.33 (82.98–89.67) | 0.04 |
| FEV1/FVC (%) | 78.06 (77.11–79.02) | 77.40 (76.19–78.61) | 0.41 |
Values are expressed as percentages and means (95% confidence intervals). FEV1, forced expiratory volume in the first second; FVC, forced vital capacity.
