Table 1 Baseline characteristics for the three groups
From: Heterogeneous burden of lung disease in smokers with borderline airflow obstruction
Variable | Group 1 Ever-smokers, Normal FEV1, \( \frac{\mathrm{FEV}1}{\mathrm{FVC}} \) < 0.7 and > LLN (Discordant Group) (n = 161) | Group 2 Ever-smokers, Normal FEV1, \( \frac{\mathrm{FEV}1}{\mathrm{FVC}} \)>  0.7 (n = 940) | Group 3 Never-smokers, Normal FEV1, \( \frac{\mathrm{FEV}1}{\mathrm{FVC}} \)>  0.7 (n = 190) | P-value |
|---|---|---|---|---|
Sex (% male) | 70.8% | 49.0% | 37.9% | < 0.001* |
Race (% white) | 89.4% | 68.2% | 70.7% | < 0.001* |
Current smoker (%) | 32.5% | 50.0% | 0% | < 0.001* |
Age (mean ± SD) | 69.3 ± 6.4 | 60.4 ± 9.7 | 56.6 ± 10.2 | < 0.001†|
Smoking history in pack-years (mean ± SD) | 48.3 ± 22.2 | 43.1 ± 27.3 | Not Applicable | 0.0‡ |