There are several ways to express how common an illness is in a population. I'm not a statistician. As I understand it the prevalence is the number of people who have the condition at the time of the survey. The incidence is the number out of 100 who will develop the condition. They are not necessairly the same number. The incidence of Alzheimers is presumably much higher than that for schizophrenia but because people don't develop Alzheimers until they are very old, you don't have as many people with Alzheimers as you do schizophrenia which you develop much younger in your life
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