100 school children: On first day of term 8 have a cold. During the first week...
100 school children: On first day of term 8 have a cold. During the first week (the study period) a further 15 develop a cold.
1. What is the prevalence on day1 ?
2. What is the cumulative incidence? First work out the population at risk on day 1
Homework Answers
The total number of childrens in the school - 100
On first day of the term 8 children had cold
During the first week -15 more children developed cold
1. Prevalence rate is the proportion of persons in a population who have a particular disease or attribute at a specified point in time or over a specified period of time.
Prevalence rate of day 1 = Number of all childrens with cold / Total number of children at that specified point in time
= 8 / 100 = 0.08 %
2. Cumulative incidence - Number of new cases of disease during a given period of time / total population at risk
= Number of new cases with cold - 15
Total number of children = 100
Cumulative incidence = 15/ 100
= 0.15
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