Cigarette smoking and tobacco chewing in relation to hypopharyngeal and laryngeal cancer risks among men.
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*PYs: Person-years of observation**Those in “unknown” category were excluded when calculating P for trend. Former smokers were also excluded when calculating P for trend for cigarettes smoked a day.Relative risk was obtained from the following model: H = Hs exp (BiXi), where background hazard, Hs, was stratified by attained age (5 year category), income and education. Xis are categorical variables for cigarette smoking/tobacco chewing.
创建时间：
2015-12-02
