00:01
Hi, this one is active in study at risk, at risk and this one active in study die seized, die, seized.
00:15
15 people were at exposer, 15 people were at exposer and 15 people were at non -exposed, non -exposed.
00:29
So, total 55 people are at risk.
00:34
45 people are at risk.
00:40
The answer of a part is, first a part is, incidence rate for both exposure, incidence rate for both exposure in first two year.
00:58
So they are students.
01:00
The students number is 30 and observation period is 12 and the student k -iit cases student cases is 4 or 15 and incident rate is 0 .66000.
01:39
So the incidence population risk is number of new, number of new cow of during injury during specific period upon size of population.
01:59
So the second year, second year incident rate, incident rate...