Table 3.

Association between prior asbestos exposure and employment status, for 2975 individuals followed during 21,905 person-years at work between 1940 and 2001

Asbestos exposure (fiber-years/mL)	Left work	Person- years	Unadjusted HR*	95% CI	Adjusted HR*,†	95% CI
<5.4	1267	6501	1		1
>5.4	1344	15,404	0.52	0.47–0.56	0.50	0.46–0.55
Total	2611	21,905

CI = confidence interval; HR = hazard ratio.

^*Accounting for age as the time scale.

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