Pre-bronchodilator spirometric data for 108 patients separated by degree of impairment of FEV1
| Impairment of FEV1 | ||||
|---|---|---|---|---|
| None (n=32) | Mild (n=19) | Moderate (n=36) | Severe (n=21) | |
| FEV1(l) | 2.31 (0.61) | 1.77 (0.44)2-160 | 1.27 (0.32)2-165 | 0.74 (0.19)2-165 |
| FEV1 (% predicted) | 94.7 (11.0) | 69.6 (6.2) | 51.4 (5.6) | 29.3 (7.0) |
| FVC (l) | 3.3 (0.8) | 2.9 (0.6) | 2.8 (0.9) | 2.25 (0.8)2-170 |
| FVC (% predicted) | 108.5 (12.7) | 93.1 (15.1)2-160 | 87.4 (15.9) | 67.0 (17.2)2-165 |
| VC (l) | 3.38 (0.88) | 2.99 (0.61) | 2.97 (0.9) | 2.47 (0.75)2-164 |
| VC (% predicted) | 110.9 (13.3) | 96.0 (15.2)2-160 | 93.8 (16.9) | 73.6 (15.8)2-165 |
| FEV1/FVC (%) | 70.6 (9.2) | 61.1 (10.4) | 47.2 (9.6)2-160 | 34.0 (7.3)2-150 |
| FEV1/VC (%) | 69.2 (9.8) | 59.2 (10.2) | 44.4 (9.3)2-160 | 30.6 (5.9)2-150 |
FEV1 = forced expiratory volume in one second; FVC = forced vital capacity; VC = relaxed vital capacity; FEV1/(F)VC% = FEV1/(F)VC ratio expressed as a percentage.
Data are means (SD).
↵2-150 p<0.05;
↵2-160 p<0.01;
↵2-165 p<0.001 compared with the adjacent less severe category of FEV1 impairment (one way ANOVA with post-hoc comparison).
↵2-164 p<0.01 severe versus no impairment;
↵2-170 p<0.001 severe versus no impairment.