Measurements Of Risk Comparison

Question 1

What is the risk ratio?

Answer 1

Ratio of prevalence proportions of outcome in groups defined by levels of exposure at a particular time (eg per 1000 persons)

(Eg Proportion dead at end of time period)

Question 2

What is the rate ratio?

Answer 2

Ratio of incidence rates of outcome in groups defined by levels of exposure after a particular time period (eg per 1,000 person-years)

(Eg incidence of death during time Period)

Question 3

In what situation is rate ratio and risk ratio the same thing?

Answer 3

When the groups have identical time periods of follow up

Question 4

What is the odds ratio?

Answer 4

Ratio of odds outcome in groups defined by levels of exposure at a particular time (odds have no measurement unit)

(No dead:no alive at end of time)

Question 5

Risk ratio, rate ratio and odds ratio can all be used to describe what?

Answer 5

Relative risk

Question 6

What is the equation for prevalence?

Answer 6

Incidence x duration of disease

Question 7

What kind of study can a risk ratio be used to analyse?

Answer 7

Cohort

Question 8

What kind of study can a rate ratio be used to analyse?

Answer 8

Cohort study

Question 9

What kind of study can an odds ratio be used to analyse?

Answer 9

Cohort study

Case-control studies