Table 3 Differences in smoking variables by the extent of emphysema on chest CT in COPD subjects
From: Epidemiology, radiology, and genetics of nicotine dependence in COPD
Extent of emphysema (%)* | ||||
|---|---|---|---|---|
Variables | None/Trivial (<5%) (n = 167) | Mild (5-25%) (n = 134) | Moderate (25-50%) (n = 31) | P |
FTND severity | 0.0008† | |||
No/low dependence | 89(44.3) | 85(42.3) | 27(13.4) | |
High dependence | 78(59.5) | 49(37.4) | 4(3.0) | |
FTND score | 5.0 ± 2.4 | 4.7 ± 2.4 | 3.4 ± 2.0 | 0.001 |
Smoking starting age, years | 16.6 ± 5.1 | 16.3 ± 4.6 | 15.6 ± 4.4 | 0.53 |
Pack-years of smoking | 47.5 ± 22.2 | 57.6 ± 35.1 | 49.7 ± 27.7 | 0.01 |
Average number of cigarettes smoked per day | 23.3 ± 9.2 | 25.0 ± 12.8 | 22.0 ± 9.4 | 0.24 |
Cigarettes/day, current | 18.8 ± 10.2 | 16.9 ± 11.8 | 11.1 ± 7.3 | 0.001 |