EMB Flashcards
1
Q
which has higher evidence strength: cross sectional or cohort
A
cohort
2
Q
what is the prevalence formula
A
all new + old cases / total pop
3
Q
what is the incidence formula
A
all new cases/ total pop
4
Q
OR formula =
A
(A/C)/(B/D)
5
Q
what does the odds ration measure
A
association between exposure and outcome
6
Q
RR =
A
(A/A+B)/(C/C+D)
7
Q
RR measures
A
risk of having + result exposed vs not
a ratio
8
Q
RRR =
A
1-RR
1-(A/A+B)/(C/C+D)
9
Q
ARR measures
A
absolute difference between + in not treated vs treated
10
Q
ARR =
A
(C/C+D)-(A/A+B)
11
Q
NNH =
A
1/ARI
12
Q
NNT =
A
1/ARR
13
Q
Attributable risk measures
A
difference between incidence rates of exposed vs not exposed
14
Q
AR =
A
(A/A+B)-(C/C+D)
15
Q
what is attrition bias
A
bias due to participants leaving the trial
