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* Sensitivity specificity
 #850072  
  tanmay - 04/10/18 11:01
 
  55 year old man visits his physician with urinary complaints. Examination finds a 1-cm nodule on his prostate gland. Physician orders a PSA serum test. By common standards, a PSA more than 4ng/ml is considered abnormal. Using this standard, this test has a sensitivity of 80% and specificity of 90%. A recent epidemiologic article found that in a cross-sectional study, 10% of men of this age group have prostate cancer. The result on the patient's PSA is 7ng/ml. What is the best estimate of the likelihood that this man actually has prostate cancer?

a) 13%
b) 25%
c) 36%
d) 47%
e) 58%
f) 69%
g) 72%
h) 81%
 
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* Re:Sensitivity specificity
#3365026
  captan - 04/10/18 11:08
 
  d) 47% ?  
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* Re:Sensitivity specificity
#3365027
  captan - 04/10/18 11:25
 
  TP =sensetivity =80%
TN=spesificity=90%
PPV = TP/TP+FP = 80/80+90 = 47%
 
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