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Proportion of never-smoker non–small cell lung cancer (NSCLC) patients. The graph shows the proportion of never smokers among NSCLC patients over the time period. The table gives the numbers of NSCLC and SCLC patients for each five-year time period. P values were calculated using a two-sided exact Cochran-Armitage trend test. NSCLC = non–small cell lung cancer; SCLC = small cell lung cancer.
