Below are data about a test used to screen individuals for H

Below are data about a test used to screen individuals for HIV. How many people carry HIV? How many tested individuals do NOT carry HIV? How many false positives are there in the initial screening test? How many false negatives are there in the initial screening test? Determine the sensitivity and the specificity of the screening test.

Solution

1. 9450+1050=10500

2. 689500

3.1050

4.6895

Sensititvity refers to the tests ability to correctly detect patients who have the condition.

S= No of true positives/no .of true positives+no of false negatives

Specificity refers to tests ability to correctly detect patients without a condition.

Sp= No. of true negatives/no.of true negatives+ no of false positives