Question

180 patients were treated for disease X from 2007 to 2009. Their progress was followed to 2010. Treatment results are given in the table. No patients were lost to follow up. No of Patients Alive on Each Anniversary of Beginning Treatment No. of Patients Treated 1t 2nad 3rd Year of Treatment 60 56 48 75 2007 55 31 63 2009 37 42 2010 152 87 48 180 Total What is the computed probability of surviving for three years? Select one: a. 43.2% b. 51.8% c. 54.8% d. 73.1 %

Answer 1

In the present scenario, 180 patients were treated for disease x from 2007 to 2009. Their progress was followed to 2010. Treatment results are given. o patients were lost to follow up.

What is the computed probability of surviving for 3 years?

This is obtained by multiplying the proportion who survived this interval by the proportion who had survived from enrollment through the end of the previous interval(s) the previous interval(s).

Thus here the answer is :

a. 43.2%