All¤ | Never-smokers | Ever-smokers | Former smokers | Current smokers | |
---|---|---|---|---|---|
(N = 3,060) | (N = 1,560) | (N = 1,459) | (N = 1,064) | (N = 395) | |
Mean age at follow-up, yrs (SD) | 46.9 (12.4) | 43.5 (12.5) | 50.6 (11.2)*** | 51.5 (11.1)*** | 48.1 (11.0)*** |
Atopy, % (N) | 18.4% (564) | 21.2% (331) | 15.4% (224)*** | 15.1% (161)*** | 16.0% (63)* |
Physician-diagnosed asthma, % (N) | 7.1% (216) | 7.6% (118) | 6.5% (95) | 6.4% (68) | 6.8% (27) |
Adult chronic bronchitis, % (N) | 5.4% (164) | 4.0% (63) | 6.9% (101)** | 5.6% (60) | 10.4% (41)*** |
Pack-years among current and former smokers, mean (SD) | NA | NA | 14.7 (12.4) | 12.6 (11.7) | 20.4 (12.3)*** |
Any exposure to irritant gases, % (N) | 48.2% (1,476) | 47.4% (740) | 49.6% (724) | 51.2% (545) | 45.3% (179) |
Gassings, % (N) | 39.8% (1217) | 37.8% (590) | 42.3% (617)* | 44.4% (472)** | 36.7% (145) |
Frequent gassings, % (N) | 11.5% (351) | 10.2% (159) | 12.9% (188)* | 13.6% (145)** | 10.9% (43) |
Unexposed workers, % (N) | 51.8% (1,584) | 52.6% (820) | 50.4% (735) | 48.8% (519) | 54.7% (216) |
Person-years at risk, sum | 57,977 | 26,548 | 30,722 | 22,677 | 8,045 |
Person-years at risk, mean (SD) | 19.1 (9.1) | 17.1 (9.3) | 21.3 (8.3)*** | 21.6 (8.2)*** | 20.7 (8.8)*** |