| FEV1:FVC ratio | |
---|
FEV1percent predicted | ≥0.7 | <0.7 | Missing | Total |
---|
Normal | 3693 | 826 | 16 | 4535 |
Mild | 974 | 2418 | 5 | 3397 |
Moderate | 758 | 2897 | 8 | 3663 |
Moderately severe | 427 | 2837 | 6 | 3270 |
Severe | 288 | 5241 | 18 | 5547 |
Very severe | 61 | 3247 | 9 | 3317 |
Missing | 1044 | 149 | 0 | 1193 |
Total | 7245 | 17,615 | 62 | 24,922 |
- Cross-tabulation of FEV1:FVC ratio and FEV1 results. FEV1 categorized as normal (≥ 80% percent predicted), mild (70–79% percent predicted), moderate (60–69% percent predicted), moderately severe (50–59% percent predicted), severe (35–49% percent predicted), or very severe (< 35% percent predicted). Abbreviations: FEV1 = forced expiratory volume in one second; FVC = forced vital capacity; PFT = pulmonary function test; VA = Veterans Affairs