QUESTION 2

1. A screening examination was performed on 550 persons for Factor X, which is found in disease Y. A definitive diagnosis for disease Y had been obtained previously. The prevalence of the condition was 10% in the population and the results of the screening are shown in the table below. Please use the table for questions 2 through 6:
   

                                                                           Disease Status                   Â
   TEST RESULTS	Disease Y Present	Disease Y Absent
   Positive for Factor X	40	50
   Negative for Factor X	10	450

   The sensitivity of this test is:

   10%

   44%

   80%

   90%

   98%

 

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