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A total of 5 CVD patients were followed up for death. The data is shown in the graph below.
(note: If it does reach at the end of year, the blue bar locates in the middle of the year)
Participants 1 2 3 4 5 Year 0 Year 01 Year 02 Year 0 Follow up years 2a. How many person
years does the cohort contribute to at the end of year 3 ? 2b. What is the case fatality rate for the
first two years in this cohort?

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