A screening test was positive in 50% of diseased and 10% of healthy population. What is the specificity of the test?
Screening Test Gold Standard Positive Negative Positive 50 10 Negative 50 90 Specificity= True Negative / True Negative + False Positives = 90/90 + 10 = 90/100 = 0.9
0.5
0.9
0.83
0.064
Sensitivity, Specificity, PPV, NPV