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Flashcards in Measures of Association Deck (13)
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1

List all of the M.O.A.

Risk ratio (cumulative incidence ratio)
• Odds ratio
• Incidence rate ratio

2

How to calculate relative risk/risk ratio

R exposed= a/a+b
R unexposed= c/c+d
RR=a/a+b/c/c+d

3

If RR=1 then...

− Risk in exposed = Risk in non-exposed − No
association

4

If RR>1 then...

Risk in exposed > Risk in non-exposed −
Positive association; ? causal

5

• If RR<1 then...

− Risk in exposed < Risk in non-exposed −
Negative association; ? protective

6

What does risk (ratio) mean

• Probability of developing a given disease
-Risk =
Number of new cases of disease/Number of persons followed/at risk

7

What is the null hypothesis for RR

RR = 1

8

What is odds ratio

Odds ratio is a ratio of the odds of an event under contrasting conditions (exposed and unexposed)

9

How do you calculate odds ratio

OD|E / OD|UE = (a/b)/(c/d) = ad/bc

10

What is the null hypothesis for odds ratio

OR=1

11

What is the MOA used for cross sectional studies

prevalence OR

12

What is the MOA fro case control studies

OR

13

What is the MOA used for RCT

RR