Table 2. Comparison of prevalence rates of abnormal conventional spirometry indices and abnormal concavity for the Tasmanian BOLD population (17).
| Index | Criterion for abnormal | n, prevalence (%) |
|
|---|---|---|---|
| Males (n=164) | Females (n=223) | ||
| FER (± FEV1% pred.) | FER <0.7 (GOLD any stage) | 46 (28.0) | 47 (21.1) |
| FER <0.7 + FEV1 ≥80% pred. (GOLD stage I) | 31 (18.9) | 27 (12.1) | |
| FER <0.7 + FEV1 ≥50% to <80% pred. (GOLD stage II) | 14 (8.5) | 17 (7.6) | |
| FEF25-75% | FEF25-75% < LLN (25) | 11 (6.7) | 20 (9.0) |
| Global Concavity Units | > ULN | 76 (46.3) | 89 (39.9) |
| Peripheral Concavity Units | > ULN | 108 (65.9) | 110 (49.3) |
| Pure peripheral Concavity | Global < ULN + peripheral > ULN | 37 (22.6) | 36 (16.1) |
GOLD, global initiative for chronic obstructive lung disease (15).