Table 3.

Cumulative Lung Cancer Mortality by Age 90 Years Under Various Simulated Asbestos Exposure Scenarios for 3,002 South Carolina Textile Workers During 117,471 Person-Years of Follow-up Between 1940 and 2001

Exposure Scenario, fiber-years/mLa,b	Lung Cancer Mortality, %	Risk Difference, %	Risk Ratio	95% Confidence Intervalc
Natural coursed	9.22	0	1	Reference
<5	8.56	−0.66	0.93	0.88, 0.99
<2	7.45	−1.77	0.81	0.71, 0.93
<0.1	6.99	−2.23	0.76	0.62, 0.94
<0.05	6.90	−2.32	0.75	0.61, 0.92

^a 1971, 1976, and current Occupational Safety and Health Administration asbestos exposure standards are <5, <2, and <0.1 fibers/mL, respectively.

^b Simulation was based on a Monte Carlo sample size of 50,000.

^c Standard error calculated as the standard deviation of 200 bootstrap samples.

^d Lung cancer mortality by age 90 years in observed data was 9.44%.