On a screening test, negative result is seen in 50% of non- diseased population and positive result in 10% healthy population. Calculate specificity:

Ans. (c) 0.83Ref: K. Park 21sted. /113* The screening test shows true negative result in 50% of diseased population* In 10% healthy population, the test shows positive result. That means 10% false positive.Putting this into formula:True Negative--------------------------False positive + True Negativex 100 50------10 + 50x 100 50------60x 100 = 83% = 0.83