Bladder cancer cannot be prevented, but you may be able to reduce some of your risk for getting it. 1  Stop smoking. Cigarette smokers are much more likely to get bladder cancer than nonsmokers. 2  Avoid exposure to industrial chemicals, such as benzene substances and arylamines.
A crude incidence, prevalence, or mortality (death rate) is one that relates to results for a population taken as a whole, without subdivision or refinement. The crude mortality from lung cancer in men in England and Wales during 1985-89 was 1034/million/year compared with 575/million/year during 1950-54.
In other words, relative risk is the ratio of two incidence rates. Prevalence is the proportion of the population that has a certain condition. Point prevalence adds the time frame to this definition, and it is the proportion of the population having the condition at a certain point of time.he critical point, alluded to by Azula R in the comments, is that the risk reflects incident cases, while prevalence reflects both new and existing cases. Thus prevalance is a function of incidence and duration of disease.