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statistics question

Discussion in 'Step I' started by herecomesthesun, May 27, 2008.

  1. herecomesthesun

    herecomesthesun Junior Member 5+ Year Member

    Nov 2, 2005
    Hey all,
    Is there a difference between how a 2x2 table is set up for a [disease v. test] and a [drug v. disease]? I know that for a study the disease goes on top and test to the left, but for a clinical trial,where does the drug/disease go in the 2x2 table? (on top or left of 2x2?)

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  3. Lany

    Lany 2+ Year Member

    May 24, 2008
    to be honest.. i would advise against studying it like this.. while it may be common to put the disease on top for either one (ie. the answer u were looking for) it doesnt mean that they cant switch it up. It shouldnt matter which way they present it, you should still be able extract the information out of the table they give. I would check twice if they give the box cause they might switch just to see if you really do understand it. When it comes to sn, sp, ppv, npv its better to understand what they mean than jus memorizing the formula and using the pattern of a/a+b etc. In any case, if you have to draw it out (likely as well) then using the common pattern could u help out. hope this helps.. ;)

    TRKATK 2+ Year Member

    Feb 14, 2008
    agreed. When I went through biostats our teacher switched it on us and said one of her former students said it was switched on the USMLE. So, understand the concept :luck:

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