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1) The cumulative survival probability at the end of the follow-up period is 0.666666667.

2) The cumulative death probability at the end of the follow-up period is 0.666666667 = 0.3333.
Person-time rate = Number of new cases of disease or injury during specified period/ Time each person was observed, totaled for all persons = 4/195 = 0.020512821 per person month
So overall death rate per 100 person-years = 100*0.020512821/12 = 0.170940175...

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