False/True Test Results

Question 1

Positive diagnostic (PT) test
Positive reference standard (MD) test

Answer 1

True + (TP)

Question 2

Positive diagnostic (PT) test
Negative reference standard (MD) test

Answer 2

False + (FP)

Question 3

Negative diagnostic (PT) test
Positive reference standard (MD test

Answer 3

False - (FN)

Question 4

Negative diagnostic (PT) test
Negative reference standard (MD) test

Answer 4

True - (TN)

Question 5

Total WITH condition

Answer 5

TP + FN

Question 6

Total WITHOUT condition

Answer 6

FP + TN

Question 7

Total who test POSITIVE

Answer 7

TP + FP

Question 8

Total who test NEGATIVE

Answer 8

FN + TN

Question 9

PPV = TP/(TP+FP)

Answer 9

Probability that someone with a + test will have the condition

Question 10

NPV = TN/(TN+FN)

Answer 10

Probability that someone with a negative test will not have the condition

Question 11

PLR = sensitivity/(1-specificity)

Answer 11

Increase in odds favoring the condition given a + test result (odds of having the condition)

Question 12

NLR = (1-sensitivity)/specificity

Answer 12

Decrease in odds favoring the condition given a - result (odds of not having the condition)

Question 13

What does LR stand for?

Answer 13

Likelihood ratio

Question 14

What does SPin mean?

Answer 14

SPecific test to rule IN a hypothesis

- specific tests have very FEW FPs –> can count on a + test being a TP

Question 15

What does a SNout mean?

Answer 15

SeNsitive test to rule OUT a hypothesis

- sensitive tests have very few FNs –> can count on a - test being a TN