Table 5.
Quartiles of lung function decline among subjects who had baseline and follow-up pulmonary function measurement (n = 16,935) and baseline FEV1, the mean annualized change in their absolute FEV1, annualized FEV1 change as a percentage of the baseline value, and annualized FEV1 change as a percentage of the baseline predicted FEV1 value
| FEV1 change quartiles | n | Baseline FEV1 (percent predicted) | Change in FEV1 (SD) | Change in FEV1 as percentage of baseline (SD) | Change in FEV1 as percentage of predicted (SD) |
|---|---|---|---|---|---|
| 1 | 4322 | 98.1 | −127 (63) | −4.7 (2.6) | −4.3 (2.2) |
| 2 | 4306 | 93.9 | −61 (10) | −2.4 (0.9) | −2.2 (0.5) |
| 3 | 4307 | 91.2 | −28 (9) | −1.2 (0.6) | −1.0 (0.4) |
| 4 | 4310 | 88.0 | 33 (72) | 1.9 (6.0) | 1.2 (2.8) |
Abbreviations: FEV1, forced expiratory volume in 1 second; SD, standard deviation.