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Number of participants by outcome status over time

in a 5-month nested case-control study

Outcome status Baseline 1 month 2 months 3 months 4 months 5 months

Outcome                      0              5         15              25                35            40

No outcome              100            95       85              75                65            60

Based on the above data, under cumulative incidence sampling, how many participants

would be in the risk-set for selecting controls?

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