Most number of false positives by a screening test is because of?a)  High specificityb)  High sensitivityc)  High prevalenced)  Low prevalence: (A) c, (B) d, (C) ab, (D) bd
Answer is D. If a population has more false positive cases : -


Screening test is more sensitive
Positive predictive value of the test is low.
Prevalence of disease is low.



If a population has more false negative cases

i)   Screening test is more specific
ii)  Negative predictive value of the test is low