Screening

Question 1

What is sensitivity?

Answer 1

The proportion of people with the disease who are correctly identified by the screening test.

Question 2

How do you calculate sensitivity?

Answer 2

True Positives / (True Positives +False Negatives)

Question 3

What is specificity?

Answer 3

The proportion of people without the disease who are correctly excluded by the screening test.

Question 4

How do you calculate specificity?

Answer 4

True negatives / (True negatives + false positives)

Question 5

What is the positive predicted value?

Answer 5

The proportion of people who have a positive test result who actually have the disease.

Question 6

How do you calculate positive predicted value?

Answer 6

True positives / (True positives + false positives)

Question 7

What is the negative predicted value?

Answer 7

Proportion of people with a negative result who are actually free of the disease

Question 8

How do you calculate negative predicted value?

Answer 8

True negatives / (true negatives + false negatives)