BIOSTATS

Question 1

LR+

Answer 1

POSITIVE LIKELIHOOD RATIO
=sensitivity / (1-specificty)

*Specificity is the probability that a person who does NOT have disease tests negative. So 1-specificity descrsibes all the rest–al those who test POSITIVE

*the higher the number, the better the test

Question 2

What is likelihood ratio

Answer 2

LR+ of 2, 5, and 10 increase the probability of disease by approximately 15%, 30%, and 45%, respectively.

Likelihood ratios provide a measure of the strength of association between a clinical finding and a specific disease.