TABLE 7.

Lung Cancer OR by Duration of Work Among Female Cooks Who Are Current Smokers, With and Without Adjustment for Tobacco Pack Years

Employment	Cases/Controls	OR1	95% CI	OR2	95% CI
Never	1,728/906	1.00		1.00
< 4 yrs	34/18	0.94	0.51–1.72	0.96	0.50–1.84
4–8 yrs	50/18	1.38	0.79–2.43	1.18	0.66–2.13
9–22 yrs	39/8	2.83	1.29–6.22	2.70	1.21–6.04
>22 yrs	16/2	4.21	0.93–18.99	4.05	0.84–19.52
Duration (cont.)	139/46	1.05	1.02–1.09	1.05	1.01–1.09
Test for trend, P value		0.004		0.011

CI, confidence interval; OR, odds ratio.

OR1 Adjusted for study and age.

OR2 Adjusted for study, age and tobacco pack-years.