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NBME 22 Answers

nbme22/Block 3/Question#34

The risk for hemorrhagic stroke from drug X is ...

Case-control study

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submitted by sunny(0),

why is this not a cross sectional survey? ... since we are asking at a particular time

drdoom  As Aristotle once quipped, “A ‘single-point in time’ doth not a cross-sectional study make.” The design of a cross-sectional study would not define “ahead of time” two cohorts (two groups); said another way, a cross-sectional design would not “split people into two groups.” In the design of a cross-sectional study there is only “one group”, and then you ask all members of that group some question (“Do you have asthma?”). At the end of a cross-sectional study, the authors will be able to make a statement like this: “We called 10,000 phone numbers with area code 415 at random and asked ‘Do you take Drug X?’ 500 responded ‘I don’t know’, 633 responded ‘Yes’, and 8,867 responded ’No’.” +1  

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submitted by bubbles(31),

So...case-control studies compare a group of people with the disease and a group of people without the disease. I'm not sure I understand why you can call people randomly and call that a control group. What if among those called randomly, some of them have also had hemorrhagic strokes?

impostersyndromel1000  this is one of those Qs where you just dont over think it and focus on your first point, that they are comparing a group with the disease vs (potentially) one without it. Thats what i took from it at least (sorry fi this is too late) +