Table 3.
Spirometric Indices*
| Baseline Spirometry (n = 145) | GLI Reference [10] | Local Reference |
|---|---|---|
| FEV1 | −1.31 (−2.10 to −0.27)† | 92.2 (79.5 to 104.6)‡ |
| FVC | −0.89 (−1.91 to −0.18)† | 93.9 (81.8 to 104.2)‡ |
| FEV1/FVC | −0.27 (−1.21 to 0.35)† | 87.9 (82.1 to 91.6)§ |
| FEF25-75% | −0.69 (−1.63 to 0.38)† | Not available |
| No abnormality, n (%) | 90 (62.1%) | 102 (70.3%) |
| Obstruction, n (%) | 26 (17.9%) | 18 (12.4%) |
| Reduced FVC, n (%) | 29 (20.0%) | 25 (17.2%) |
| Reversibility Testing | FEV % Change | Reversible, n (%) |
| Reduced FVC pattern (n = 26) | 2.6 (−3.6 to 9.5) | 8 (30.8%) |
| Obstructive pattern (n = 21) | 3.3 (−4.3 to 12.1) | 7 (33.3%) |
| All (n = 47) | 2.7 (−4.3 to 10.1) | 15 (31.9%) |
Abbreviations: FEF25–75%, forced expiratory flow at 25%–75%; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; GLI, Global Lung Initiative; IQR, interquartile range.
*Continuous data presented as median (IQR) due to skewed distributions. Includes all traces meeting ATS criteria (grades A and B), n = 145 at baseline, n = 47 for reversibility testing.
†Median z-score (IQR).
‡Median percentage of predicted (IQR).
§Median percentage (IQR).