Misc. 1 - stats

Question 1

Positive likelihood ratio (LR+) =

Answer 1

Sensitivity / (1 - specificity)

Question 2

Explain what a (+) likelihood ratio is.

Answer 2

How likely a positive result represents a true positive

Question 3

Negative likelihood ratio (LR-) =

Answer 3

(1 - sensitivity) / specificity

Question 4

Is a better LR+ high or low?

Answer 4

High

Question 5

Is a better LR- high or low?

Answer 5

Low

Question 6

NNT =

Answer 6

1/ARR

Question 7

RR =

Answer 7

(AR in Tx group) / (AR in control group)

Question 8

Relative risk reduction (RRR) =

Answer 8

1 - RR