Chronic obstructive pulmonary disease (COPD) prevalence according to smoking history
| Gender | Age group | Non-smokers | Pack-years (smokers and ex-smokers) | Total (smokers and ex) | ||
| 1–14 | 15–30 | >30 | ||||
| Men | 40–49 | 3/153 (2.0) | 6/152 (4.0) | 10/197 (5.1) | 7/83 (8.4) | 23/432 (5.3) |
| OR (95% CI) | 1 | 2.1 (0.5 to 8.6) | 2.7 (0.7 to 10.0) | 4.6 (1.2 to 18.3) | 2.8 (0.8 to 9.5) | |
| 50–59 | 5/134 (3.7) | 4/100 (4.0) | 16/135 (11.9) | 26/139 (18.7) | 46/374 (12.3) | |
| OR (95% CI) | 1 | 1.1 (0.3 to 4.2) | 3.5 (1.2 to 9.8) | 5.9 (2.2 to 15.9) | 3.6 (1.4 to 9.3) | |
| 60–69 | 10/114 (8.8) | 7/59 (11.9) | 18/87 (20.7) | 54/147 (36.7) | 79/293 (27.0) | |
| OR (95% CI) | 1 | 1.4 (0.3 to 2.1) | 2.7 (1.2 to 6.2) | 6.0 (2.9 to 12.5) | 3.8 (1.9 to 7.6) | |
| 70–80 | 19/88 (21.6) | 7/38 (18.4) | 22/53 (41.5) | 58/116 (50.0) | 87/207 (42.0) | |
| OR (95% CI) | 1 | 0.8 (0.3 to 2.1) | 2.6 (1.2 to 5.5) | 3.6 (1.9 to 6.7) | 2.6 (1.5 to 4.6) | |
| Women | 40–49 | 4/223 (1.8) | 1/178 (0.6) | 12/214 (5.6) | 4/44 (9.1) | 17/436 (3.9) |
| OR (95% CI) | 1 | 0.3 (0 to 2.7) | 3.3 (1.0 to 10.0) | 5.5 (1.3 to 22.9) | 2.2 (0.7 to 6.6) | |
| 50–59 | 11/318 (3.5) | 2/118 (1.7) | 7/115 (6.1) | 7/55 (12.7) | 16/288 (5.6) | |
| OR (95% CI) | 1 | 0.5 (0.1 to 2.3) | 1.8 (0.7 to 4.8) | 4.1 (1.5 to 11.1) | 1.6 (0.7 to 3.5) | |
| 60–69 | 24/322 (7.5) | 2/33 (6.1) | 1/40 (2.5) | 5/27 (18.5) | 8/100 (8.0) | |
| OR (95% CI) | 1 | 0.8 (0.2 to 3.5) | 0.3 (0 to 2.3) | 2.9 (1.0 to 8.1) | 1.1 (0.5 to 2.5) | |
| 70–80 | 24/283 (8.5) | 2/15 (13.3) | 3/8 (37.5) | 5/10 (50.0) | 10/33 (30.3) | |
| OR (95% CI) | 1 | 1.7 (0.4 to 8.0) | 6.5 (1.5 to 29.0) | 10.8 (2.9 to 40.0) | 4.7 (2.0 to 11.0) | |