Pre- and post- test odds and probability Flashcards
1
Q
proportion of people with the target disorder in the population at risk at a specific time or time interval
A
Pre-test probability
point prevalence vs period prevalence
2
Q
proportion of patients with that particular test result who have the target disorder
A
Post-test probability
3
Q
post test odds / (1 + post-test odds) =?
A
Post test probability
4
Q
odds that the patient has the target disorder before the test is carried out
A
Pre-test odds= pre-test probability / (1 - pre-test probability)
5
Q
odds that the patient has the target disorder after the test is carried out
A
Post-test odds = pre-test odds x likelihood ratio*
*where the likelihood ratio for a positive test result = sensitivity / (1 - specificity)
6
Q
A
