Epi

Question 1

Absolute risk reduction

Answer 1

Absolute Risk Reduction (ARR) = the AR of events in the control group - the AR of events in the treatment group

Question 2

Number needed to treat

Answer 2

1/ ARR (% events in control - % of events in treatment group)

Question 3

Relative risk

Answer 3

Events in the treatment group/events in the control group

Question 4

Absolute Risk

Answer 4

Number of events in the group/Total number of people in that group

Question 5

Relative Risk Reduction

Answer 5

1 - RR (which is events in treatment/events in control)

Question 6

Sensitivity

Answer 6

People who tested positive/ All people with the disease

Question 7

Specificity

Answer 7

People who tested negative/all people WITHOUT the disease
= d/(b+d)

Question 8

PPV

Answer 8

People who tested positive AND HAD THE DISEASE/ All people who tested positive

Question 9

NPV

Answer 9

People who tested negative and DID NOT HAVE THE DISEASE/ All people who tested negative