EMB

Question 1

which has higher evidence strength: cross sectional or cohort

Answer 1

cohort

Question 2

what is the prevalence formula

Answer 2

all new + old cases / total pop

Question 3

what is the incidence formula

Answer 3

all new cases/ total pop

Question 4

OR formula =

Answer 4

(A/C)/(B/D)

Question 5

what does the odds ration measure

Answer 5

association between exposure and outcome

Question 6

RR =

Answer 6

(A/A+B)/(C/C+D)

Question 7

RR measures

Answer 7

risk of having + result exposed vs not
a ratio

Question 8

RRR =

Answer 8

1-RR
1-(A/A+B)/(C/C+D)

Question 9

ARR measures

Answer 9

absolute difference between + in not treated vs treated

Question 10

ARR =

Answer 10

(C/C+D)-(A/A+B)

Question 11

NNH =

Answer 11

1/ARI

Question 12

NNT =

Answer 12

1/ARR

Question 13

Attributable risk measures

Answer 13

difference between incidence rates of exposed vs not exposed

Question 14

AR =

Answer 14

(A/A+B)-(C/C+D)

Question 15

what is attrition bias

Answer 15

bias due to participants leaving the trial

Question 16

what is ascertaion bias

Answer 16

interpretation of results being impacted by experimenter knowing which intervention the participant received

Question 17

what is performance bias

Answer 17

bias due to groups being treated differently