Table 5.

Association between employment status and lung cancer mortality for 2975 individuals followed during 115,643 person-years between 1940 and 2001

Employment status	Lung cancer deaths	Person- years	Unadjusted HR*	95% CI	Adjusted HR*,†	95% CI
At work	16	21,905	1		1
Left work	177	93,738	0.48	0.28–0.82	0.52	0.29–0.94
Total	193	115,643

CI = confidence interval; HR = hazard ratio.

^*Accounting for age as the time scale.

^†Adjusting for gender, race, and birth year (by restricted quadratic spline).