A screening examination was performed on 250 persons for Factor X, which is found in disease Y A definitive diagnosis for disease Y among the 250 persons had been obtained previously The results are charted below RESULTS OF DIAGNOSIS Test Results Disease Present Disease Absent Positive for Factor X 40 60 Negative for Factor X 10 140 The positive predictive value of this test is 40 56 70 80 93

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Question: A screening examination was performed on 250 persons for Factor X, which is found in disease Y. A definitive diagnosis for disease Y among the

A screening examination was performed on 250 persons for Factor X, which is found in disease Y. A definitive diagnosis for disease Y among the 250 persons had been obtained previously.

The results are charted below:

RESULTS OF DIAGNOSIS
Test Results	Disease Present	Disease Absent
Positive for Factor X	40	60
Negative for Factor X	10	140

The positive predictive value of this test is:

		40%
		56%
		70%
		80%
		93%

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