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phuluong2k
Forum Newbie  Topics: 715 Posts: 2008 |
A physiccian interviews an 18 year old female patient who mentions that she has just received a negative syphilis test result from the county health department. She describe her sense of relief at receiving the test result. She discloses that she is a sex worker who "works the stroll" four to five nights a week. She has been " tricking" for the past 18 months. Typically, she has oral or vaginal sex with five to eight customers pernight For a higher fee, she will have sex without requiring her customer to wear a condom. On the basis of these finding, the physycian is likely to be most concerning with which of the following screening test measures ? A. Sensitivity B. Specificity C. Positive predictive value D. Negative predictive value E. Accuracy Plz give your explanation
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Springd
| Forum Junior Topics: 5 Posts: 62
A.
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phuluong2k
| Forum Newbie Topics: 715 Posts: 2008
the answer is Negative predictive value, but there is not an explanation I think this q is confusing because there is a positve correlation between sensitive & NPV so may be both A & D are correct ???
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chemamr
| Forum Hero  Topics: 340 Posts: 4448
i thought NPV, but I have no explanation. Biostatistics and epidemiology are weak areas for me.
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Merih
| Forum Junior Topics: 9 Posts: 59
In USMLEWORLD BIOSTAT&PREV.MED. MCQS-answers, these are well explained. NPV of the syphilis test is more imp. than sensitivity.it's the factor that determines reliability of the result. UW explains better than me.
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mdwannabe
| Forum Guru Topics: 37 Posts: 1131
NPV... She just recieved a negative result, but she is still in high-risk setting..therefore..how likely is she to be really Negative in the face of negative result. Hope this helps.
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guayoman
| Forum Elite  Topics: 44 Posts: 273
NPV, accuracy and specificity all talk about the probability of the negative result being actually negative. So you could answer any of the 3 options and you would be correct. But, why is NPV the best answer for the Q? NPV: The proportion of people with a negative screening test result who are well. Edited by guayoman on Aug 17, 2005 - 2:42 PM
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guayoman
| Forum Elite Topics: 44 Posts: 273
This thing is scrambling my post. I can´t edit it!   
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guayoman
| Forum Elite Topics: 44 Posts: 273
The thing is IF you knew for a fact that she was NEG then you could use specificity. accuracy is just to complicated to be right answer. HAHA
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