Clinical characteristics | All patients studied | Pneumothorax | ||||
---|---|---|---|---|---|---|
Median | Lower quartile –upper quartile | Yes* | No* | Z | P Value† | |
No. of cases analyzed | 343 | 50 (14.6%) | 293 (85.4%) | |||
Pulmonary function characteristics | ||||||
FVC (% pred) | 103.3 | 92.0–115.5 | 105.0 (93.3–114.8) | 103.0 (91.6–115.7) | − 0.363 | 0.716 |
FEV1 (L) | 2.4 | 2.0–2.9 | 2.4 (1.9–2.7) | 2.4 (2.0–3.0) | − 0.700 | 0.484 |
FEV1 (% pred) | 98.0 | 81.7–109.9 | 94.8 (79.4–106.8) | 98.4 (82.0–110.1) | − 1.101 | 0.271 |
FEV1/FVC ratio (%) | 76.0 | 69.1–81.2 | 72.5 (67.1–78.4) | 76.6 (69.8–81.5) | − 2.897 | 0.004 |
FEF25% (% pred) | 88.4 | 64.0–106.1 | 73.5 (56.5–102.5) | 89.5 (66.6–106.5) | − 1.950 | 0.051 |
FEF50% (% pred) | 72.8 | 48.9–94.6 | 58.5 (39.8–84.5) | 77.5 (51.7–95.9) | − 2.458 | 0.014 |
FEF75% (% pred) | 66.4 | 44.7–89.9 | 55.7 (42.1–79.4) | 70.5 (45.4–91.1) | − 2.085 | 0.037 |
FEF25–75% (% pred) | 58.0 | 37.4–78.6 | 44.3 (30.0–66.3) | 59.6 (39.4–79.8) | − 2.134 | 0.033 |
PEF (% pred) | 104.4 | 84.4–119.6 | 101.5 (83.2–114.7) | 104.5 (85.0–121.0) | − 1.253 | 0.210 |
MVV (% pred) | 95.7 | 83.3–111.9 | 96.4 (83.6–109.2) | 95.5 (83.2–112.7) | − 0.382 | 0.703 |