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* nbme 7 block 4
 #580078  
  muneca47 - 04/14/11 15:19
 
  A new test for CAD is reported to have a sensitivity of 90% and specificity of 95%. In a matched case control study. A validation study is performed in 1000 patients comparing this new test to the gold standard test: coronary artery angiography. Results are shown:
PRESENT ABSENT
TEST (+) 80 90 170
TEST (-) 20 810 830
100 900 1000
wHICH OF THE following is the specificity in this study?
a) 20/80=25%
b) 80/90=89%
c) 80/100=80%
d)80/170=47%
e)100/1000=10%
f)810/830=98%
g)810/900=90%
 
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* Re:nbme 7 block 4
#2377063
  firstaid1984 - 04/14/11 15:23
 
  ggggg  
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* Re:nbme 7 block 4
#2377068
  muneca47 - 04/14/11 15:43
 
  firstaid1984, why g..? can you explain please....  
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* Re:nbme 7 block 4
#2377084
  moemoe - 04/14/11 16:04
 
  TN /(TN+FP)

 
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* Re:nbme 7 block 4
#2377099
  firstaid1984 - 04/14/11 16:37
 
  ya,
specificity=TN/TN+FP=810/810+90=810/900= G
 
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* Re:nbme 7 block 4
#2377110
  muneca47 - 04/14/11 16:50
 
  thank u x the explanaton both of you  
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