Table 2 Characteristics Used for Ordinal Ranking of Spirometrically-defined States at Baseline Examination Visit, Among ‘All Smokers’, Albuquerque, New Mexico, 2001–2015, Lovelace Smokers’ Cohort
From: Spirometric variability in smokers: transitions in COPD diagnosis in a five-year longitudinal study
Characteristic | Smokers with normal spirometry (n = 956) | COPD GOLD stage I (n = 145) | GOLD Unclassified (n = 191) | COPD GOLD stage II+ (n = 261) | P value |
|---|---|---|---|---|---|
SGRQ total score | 17.0 ± 15.2 | 17.9 ± 13.9 | 25.6 ± 19.2 | 31.6 ± 19.8 | <0.001 |
SGRQ symptom subscale score | 25.6 ± 21.1 | 29.9 ± 21.7 | 33.1 ± 23.1 | 41.6 ± 24.4 | <0.001 |
SGRQ activity subscale score | 25.6 ± 22.7 | 25.0 ± 21 | 37.3 ± 26.3 | 43.8 ± 25.7 | <0.001 |
SGRQ impact subscale score | 8.5 ± 11.9 | 8.7 ± 9.8 | 14.8 ± 16.4 | 18.7 ± 16.7 | <0.001 |
FEV1 (in liters) | 2.8 ± 0.6 | 2.7 ± 0.7 | 2.1 ± 0.5 | 1.7 ± 0.6 | <0.001 |
FEV1 percent predicted | 97.4 ± 10.6 | 91.0 ± 8.9 | 72.0 ± 8.5 | 61.2 ± 14.7 | <0.001 |