For weeks 14 calculate the prevalence and incidence rates an

For weeks 1-4, calculate the prevalence and incidence rates, and express them as decimals.

Prevalence rate= All new and pre existing cases during a time period x 10ⁿ

Population during the time period

At 1st week = (105+0)/920x 10¹=1.14

At 2nd week = (180+105)/740x 10²=38.51

At third week = (390+180)/350x 10³=162.85

At fourth week = (325+390)/25x 10⁴=286,000

Incidence rate= new cases occuring during a given time period x 10ⁿ

Population at risk at that time period

At 1st week = 105/920 x 10¹ = 1.14

At 2nd week = 180/740 x 10²=24.32

At 3rd week = 390/350 x 10³=1114.28

At 4th week = 325/25 x 10⁴ = 130,000