Table 3.

The relationship between age at first asbestos exposure and lung cancer

Study (Type of risk)	Age at first exposure	Risk	95% CI a
Chen M (2012) [22] (SMRb)	< 20 years	7.70	3.7-14.2
	≥ 20 years	8.50	2.3-21.8
Pira E (2007) [25] (SMRb)	< 25 years	281	Does not include 100
	25-34 years	424	Does not include 100
	≥ 35 years	269	Does not include 100
Luce D (2000) [27] (ORc)	Men
	Birth	0.93d	0.5-1.8
	< 20 years	0.72d	0.2-3.1
	≥ 20 years	0.85d	0.3-2.9
	Women
	Birth	2.51d	0.9-6.8
	< 20 years	2.03d	0.2-25.9
	≥ 20 years	2.93d	0.3-25.5

^aCI Confidence intervals.

^bSMR Standardized Mortality Ratio.

^cOR Odds Ratio.

^d Odds ratio adjusted for age (≤55, 56–65, >65 years) and smoking in pack-years: four categories for men (<20, 20–39, 40–59, ≥60) and three categories for women (never smoker, <20, ≥20).