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sensitivity Qs from usmlerx - knsmsi

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sensitivity Qs from usmlerx - knsmsi
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#1
04-17-2008, 07:06 PM
fecal occult blood test(FOB) screening test is used in 203 people to look for colon cancer.20 pt tested as positive with FOB screening.endoscopic examination later confirmed 2 of the pts have colon cancer.one additional pt who had tested negative fob was also found to have colon cancer.what is the sensitivity of this study?
A)10%
B)100%
C)66%
D)91%
E)99.45%
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#2
04-17-2008, 07:11 PM
ccc
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#3
04-17-2008, 07:22 PM
PLS EXPLAIN
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#4
04-17-2008, 07:27 PM
66% is correct
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#5
04-17-2008, 07:30 PM
E.......174/175
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#6
04-17-2008, 07:30 PM
TP = 2, FN = 1, sensitivity = TP/(TP+FN) = 67%
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#7
04-17-2008, 07:41 PM
COLON CA +VE -VE

FOB+VE 2 18

FOB-VE 1 182

FROM THIS TABLE
sensitivity=2/2+1=66%
specificity=18/18+182
ppv=2/2+18=10%
npv=182/182+1
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