From: Case-control study of tobacco smoke exposure and breast cancer risk in Delaware
Secondhand smoke exposure at worka | cases | controls | odds ratiob | 95% confidence Intervalb | ||
---|---|---|---|---|---|---|
n | % | n | % | |||
Never employed or | ||||||
not exposed at work | 60 | 48.4 | 69 | 43.4 | 1.00 | Reference |
Any secondhand smoke exposure at work | 64 | 51.6 | 90 | 56.6 | 0.80 | 0.49–1.32 |
Number of years employed at a job with secondhand smoke exposure | ||||||
< 10 | 27 | 21.8 | 48 | 30.1 | 0.66 | 0.35–1.23 |
10–19 | 24 | 19.4 | 27 | 17.0 | 1.02 | 0.52–2.00 |
20–45 | 13 | 10.5 | 15 | 9.4 | 0.86 | 0.35– 2.07 |
Number of years employed at a job with light secondhand smoke exposure | ||||||
< 10 | 17 | 13.7 | 27 | 17.0 | 0.96 | 0.46–1.97 |
≥ 10 | 13 | 10.5 | 13 | 8.2 | 1.14 | 0.47– 2.78 |
Number of years employed at a job with moderate secondhand smoke exposure | ||||||
< 10 | 11 | 8.9 | 16 | 10.1 | 0.70 | 0.29– 1.68 |
≥ 10 | 17 | 13.7 | 22 | 13.8 | 1.01 | 0.49– 2.09 |
Number of years employed at a job with heavy secondhand smoke exposure | ||||||
< 10 | 5 | 4.0 | 8 | 5.0 | 1.02 | 0.31– 3.37 |
≥ 10 | 7 | 5.6 | 7 | 4.4 | 1.07 | 0.35– 3.30 |