kiterunner
Forum Junior
Topics: 14
Posts: 65
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a 55 yr old man has 1-cm nodule in prostate and has complaints of urinary infrequesncy. A PSA test is ordered. Conventionally a PSA greater than 4 ng/mL is considered abnormal. Using this standard, this test has a 80% sensitivity and 90% specificity. a recently published article found on a cross sectional study, 10% of men of his age has prostate cancer. his PSA result is 7ng/mL. what is ur best estimate of the likelihood that this man has prostate cancer
a.13%
b.25%
c.36%
d.47%
e.58%
f.69%
g.72%
h.81%
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| Jackofknives
Ipwnpoker.com
Topics: 91
Posts: 707
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He is testing positive. The test has a 80% sensitivity so he has 80% chance to truly have prostate cancer.
h
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| kiterunner
Forum Junior
Topics: 14
Posts: 65
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it`s not the answer Jack.
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| po
Forum Elite
Topics: 39
Posts: 356
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I think they r asking for positive predictive value
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| po
Forum Elite
Topics: 39
Posts: 356
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ANS-d.47%
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| po
Forum Elite
Topics: 39
Posts: 356
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Sensitivity 80%means out of 10%prevalant population -->
8 would test TRUE POSITVE and 2 would test FALSE NEGATIVE.
Specificity 90% means out of 90cancer free[100total-10prevalance=90cancer free]-->
81 would test TRUE NEGATIVE and 9 would test FALSE POSITIVE.
So we have
PPV=TP/TP+FP
PPV=8/8+9=8/17=0.47
that would be 47%
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| kiterunner
Forum Junior
Topics: 14
Posts: 65
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| paheli
It'sAllAboutGoodKarma
Topics: 177
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brainbox, po!! impressive!!
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| Jackofknives
Ipwnpoker.com
Topics: 91
Posts: 707
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Thx, i get it now
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There are many things in this world that can’t be changed no matter how hard you try. That’s why you must not hesitate when the time comes where you have to give it all you’ve got.
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| po
Forum Elite
Topics: 39
Posts: 356
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I feel ashamed,its not brain.. its googling
click this link from the google page,
[PPT]Teaching Family Physicians To Be Information Masters
File Format: Microsoft Powerpoint - View as HTML
http://www.google.com/search?q=sensitivity+specif...
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