Among all deaths from a particular disease, the percentage that issmoking related (21-39
Chapter 3, Problem 103(choose chapter or problem)
Among all deaths from a particular disease, the percentage that issmoking related (21-39 cigarettes per day) is aftmction of the disease~'i incidenc(! ratio. The inddence ratio describes the number of times more likely smokers are than nonsmokers to die from the disease. The following table shows the incidenu ratios for heart dise.ase and lung cancer for two age groups. Ages 55-{;4 Ages 65-74 ladde"ce Rati05 He-.u1 Disease 1.9 1.7 Lung Cancer 10 9 Source: Alexander M. Walker, ObservtJtion.s and lnferem:e, Epidemiology Resources Inc., 1991. For example. the incidence ratio of9 in ih(! table means that smokers btftween the ages of65 and 74 are 9 fimes more likely than nonsmokers in the same age group to die from lung
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