Which of the following represent 10 person years of followup

Which of the following represent 10 person years of follow-up?

a.Two people followed for three years each

b.One person followed for ten years

c.Ten people followed for two years each

d.Twenty people each followed for one month

Solution

10 person years means taking the product of the number of persons times the number of years you follow-up.

a) 2*3 = 6, not 10.
b) 1*10 = 10 [ANSWER]
c) 10*2 = 20, not 10.
d) 20*(1/12) = 1.667, not 10.

Hence, OPTION B: One person followed for ten years [ANSWER]