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| * nbme 3 biostat Q |
| | #531360 |
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if 1 person in 10,000 with negative PPD skin test has active TB,and 1 person in 100 with the positive PPD has active PPD,which of the following is estimated relative risk of active TB in persons with positive PPD skin test.
a. 1
b. 9.9
c. 100
d. 1000
e. 10,000
pls explain ur ans. |
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| * Re:nbme 3 biostat Q |
| #2188510 |
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1. Risk of active TB in PPD+ is 1/100
2. Risk of active TB in PPD- is 1/10,000
3. Relative risk of active TB in PPD+ to PPD- is (1/100) / (1/10,000) = 100.
Not 100% sure though. |
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