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For a 10 percent sample of all white male lung-cancer deaths in the United States during 1958, residence and smoking histories were collected from family informants and additional diagnostic details from certifying physicians. Residence and smoking histories were also obtained for a sample of the general population from the U.S. Bureau of the Census Current Population Survey. A major objective was to study gradients in lung-cancer mortality among groups classified with respect to lifetime resi-dence history, controlling for smoking history. The interaction of residence
Haenszel et al. (Sun,) studied this question.