Table 3.
Frequency of COPDa and Moderate to Severe COPDb by Smoking Habit Between 2001 and 2016 in the Tromsø Study
| 2001–2 (Tromsø 5) n=4492 | 2007–8 (Tromsø 5) n=5929 | 2015–16 (Tromsø 5) n=7142 | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Smoker Group | COPD | Moderate to Severe COPD | Smoker Group | COPD | Moderate to Severe COPD | Smoker Group | COPD | Moderate to Severe COPD | |||||||
| n | n | (%) | n | (%) | n | n | (%) | n | (%) | n | n | (%) | n | (%) | |
| Never smoker | 1476 | 49 | (3.3) | 34 | (2.3) | 2056 | 37 | (1.8) | 20 | (1.0) | 2893 | 51 | (1.8) | 22 | (0.8) |
| Previous smoker | 1872 | 167 | (8.9) | 133 | (7.1) | 2782 | 236 | (8.5) | 139 | (5.0) | 3392 | 273 | (8.0) | 146 | (4.3) |
| Current smoker | 1144 | 220 | (19.2) | 154 | (13.5) | 1091 | 195 | (17.9) | 124 | (11.4) | 857 | 158 | (18.4) | 92 | (10.7) |
Notes: aFEV1/FVC<LLN in subjects reporting dyspnea or cough. bFEV1/FVC<LLN and FEV1<LLN in subjects reporting dyspnea or cough.