Critical numbers formula Flashcards
1
Q
Odds
A
cases/no cases
2
Q
OR
A
(control[ex]/control[un])
3
Q
incidence
A
cases in given time/# at risk
4
Q
attributable risk
A
incidence[ex]-incidence[un]
5
Q
RRR
A
100-RR
6
Q
NNT
A
1/ARR (decimal)
7
Q
ARR
A
incidence[un]-incidence[ex]
8
Q
RR
A
incidence [un]
9
Q
how to remember ARR, RR and attributable risk
A
all use just incidence[ex] and incidence[un]
if it begins with A, it’s a minus
if it’s only two letters, it starts with EX
