Flashcards in Measures of Association Deck (13)
List all of the M.O.A.
Risk ratio (cumulative incidence ratio)
• Odds ratio
• Incidence rate ratio
How to calculate relative risk/risk ratio
R exposed= a/a+b
R unexposed= c/c+d
If RR=1 then...
− Risk in exposed = Risk in non-exposed − No
If RR>1 then...
Risk in exposed > Risk in non-exposed −
Positive association; ? causal
• If RR<1 then...
− Risk in exposed < Risk in non-exposed −
Negative association; ? protective
What does risk (ratio) mean
• Probability of developing a given disease
Number of new cases of disease/Number of persons followed/at risk
What is the null hypothesis for RR
RR = 1
What is odds ratio
Odds ratio is a ratio of the odds of an event under contrasting conditions (exposed and unexposed)
How do you calculate odds ratio
OD|E / OD|UE = (a/b)/(c/d) = ad/bc
What is the null hypothesis for odds ratio
What is the MOA used for cross sectional studies
What is the MOA fro case control studies