Which one of the following will be affected by inter- observer variation in epidemiological studies: (A) Sensitivity, (B) Predictive value of the positive test, (C) Specificity, (D) Reliability
Answer is A. the term sensitivity was introduced by Yerushalmy in 1940 s as a statistical index of diagnostic accuracy.it has been defined as the ability of a test to identify correctly all those who have the disease that is true positive.it also gets affected by the intern observer variations in the epidemiological studies. ref:park&;s textbook of preventive and social medicine,22 nd edition,pg no 131 .