Lung Cancer Risk and Past Exposure to Emissions from a Large Steel Plant

Table 1

Standardized incidence ratios for lung cancer.

SIR	Age standardization	Age + spatial smoothing	Age + spatial smoothing + SES
Mean	1.01	1.00	0.97
Median	0.97	0.97	0.97
Standard deviation	0.43	0.17	0.08
Minimum	0.00	0.66	0.81
Maximum	3.55	1.41	1.20
Interquartile range	0.79–1.21	0.86–1.12	0.90–1.04

Distribution of SIRs for lung cancer within the study area after indirect standardization for age and sex, spatial smoothing, and correcting for the influence of SES.