Homework Answers
1.Period prevalence is the number of individuals identified as cases during a specified period of time, divided by the total number of people in that population
Period prevalence = number of cases of prostate cancer /total population × 1000
At the beginning , 50males had prostate cancer out of 2000
So prevalence = 50/2000×1000
= 25%
After 5years , now total number of males with prostate cancer is 250+50 (beginning ) = 300
Prevalence rate = 300/2000×1000
= 150%
2. Risk ratio - incidence rate in exposed group / incidence rate in unexposed group
Incidence rate in exposed group is - number of new cases who were exposed to cyanide= 200(who got prostate cancer) /950(total population who were exposed to cyanide ) × 1000
= 210.5 %
Incidence rate of unexposed group - 50( who got prostate cancer ) /1000(total population of unexposed group) ×1000= 50%
Risk ratio = 210.5/50 = 4.21
3. Risk attribute to exposure is cyanide
4. Total number of males with prostate cancer is 300 ,out of that 200 males were exposed to cyanide
So the proportion = 200/300 = 2/3
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