A diagnostic test for a paicular disease has a sensitivity, of a 0.90 and a specificity of 0.80. A single test is applied to each subject in the population in which the diseased population is 30%. What is the probability that a person, negative to this test, has no disease -: (A) Less than 50%, (B) 70%, (C) 95%, (D) 72%
Answer is C. Ans. is 'c' i.e., 95% o The probability of not having a disease after a negative screening test is measured by negative predictive value.