Table 5.
Lung function among 260 Dutch and 151 Swiss chronic obstructive pulmonary disease patients (total cohort N = 411) enrolled in the International Collaborative Effort on Chronic Obstructive Lung Disease: Exacerbation Risk Index Cohorts prospective cohort study
| Dutch cohort | Swiss cohort | Total cohort | ||
|---|---|---|---|---|
| FEV1 (l) | p5, p50, p95 | 0.64, 1.44, 2.56 | 0.63, 1.50, 2.47 | 0.63, 1.45, 2.56 |
| FEV1, % of predicted | p5, p50, p95 | 26, 58, 77 | 24, 59, 79 | 25, 59, 78 |
| FVC (l) | p5, p50, p95 | 1.66, 2.84, 4.55 | 1.43, 2.84, 4.42 | 1.56, 2.84, 4.48 |
| FVC, % of predicted | p5, p50, p95 | 57, 90, 118 | 53, 84, 117 | 55, 88, 118 |
| FEV1/FVC | p5, p50, p95 | 0.29, 0.52, 0.67 | 0.31, 0.57, 0.70 | 0.29, 0.53, 0.68 |
| Inspiratory capacity | p5, p50, p95 | 0.95, 2.13, 3.68 | 1.32, 2.39, 3.63 | 1.13, 2.23, 3.63 |
| Quality of measurement n (%) |
A | 162 (62.3) | 58 (38.4) | 220 (53.5) |
| B | 64 (24.6) | 22 (14.6) | 86 (20.9) | |
| C | 34 (13.1) | 36 (23.8) | 70 (17.0) | |
| D | 0 (0.0) | 34 (22.5) | 34 (8.3) | |
| Less than D | 0 (0.0) | 1 (0.7) | 1 (0.2) | |
| GOLD II (50 ≤ FEV% < 80) n (%) |
174 (66.9) | 95 (62.9) | 269 (65.5) | |
| GOLD III (30 ≤ FEV% < 50) n (%) |
64 (24.6) | 40 (26.5) | 104 (25.3) | |
| GOLD IV (FEV1 % < 30) n (%) |
22 (8.5) | 16 (10.6) | 38 (9.3) |
Abbreviations: FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; GOLD, Global Initiative for Chronic Obstructive Lung Disease; p5, fifth percentile; p50, median; p95, 95th percentile.