Incidence and Prevalence
Exercise C
The County Y Head Start Program enrolled 500 children in the Fall of 1995. All of these children were screened for vision problems at the beginning of the year and 50 were found to have vision problems.
When the same 500 children are screened again in the Fall of 1996, 65 are found to have vision problems.
1. What was the prevalence of vision problems in County Y’s Head Start program in 1995?
2. What was the prevalence of vision problems in County Y’s Head Start program in 1996?
3. What is the risk of developing vision problems between the Fall of 1995 and the Fall of 1996 in this group of Head Start children?
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