Screening test statistics

Question 1

Sensitivity

Answer 1

TP / (TP + FN )

Proportion of patients with the condition who have a positive test result

Question 2

Specificity

Answer 2

TN / (TN + FP)
FP) Proportion of patients without the condition who have a negative test result

Question 3

Likelihood ratio for a positive test result

Answer 3

sensitivity / (1 - specificity)

Question 4

Likelihood ratio for a negative test result

Answer 4

(1 - sensitivity) / specificity

Question 5

negative predictive value ?

Answer 5

The chance that the patient does not have the condition if the diagnostic test is negative

Question 6

positive predictive value ?

Answer 6

The chance that the patient have condition if the diagnostic test is positive

Question 7

Positive predictive value

Answer 7

TP / (TP + FP)

Question 8

Negative predictive value

Answer 8

TN / (TN + FN)

Question 9

Likelihood ratio for a positive test result meaning

Answer 9

How much the odds of the disease increase when a test is positive

Question 10

Likelihood ratio for a negative test result

Answer 10

How much the odds of the disease decrease when a test is negative