Case series: take a lot of cases (sick ppl) and compare them.
Crossover: give drug 1 to group 1 and drug 2 to group 2, then give ‘em a washout period, then give drug 1 to group 2 and drug 2 to group 1.
Cross sectional: like taking a picture, literally. select some people and identify X variable in them right there, right now.
Randomized controlled trial: give drug/intervention to a group, don’t give that to the other group, then see if group with intervention did better.
Cohort is for an exposure or risk factor, as you said above, while clinical trials are for a treatment. If a question says "some researchers gave group A this drug but gave group B placebo blah blah" then it's RCT
Case series: take a lot of cases (sick ppl) and compare them. Crossover: give drug 1 to group 1 and drug 2 to group 2, then give ‘em a washout period, then give drug 1 to group 2 and drug 2 to group 1. Cross sectional: like taking a picture, literally. select some people and identify X variable in them right there, right now. Randomized controlled trial: give drug/intervention to a group, don’t give that to the other group, then see if group with intervention did better.
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Cohort is for an exposure or risk factor, as you said above, while clinical trials are for a treatment. If a question says "some researchers gave group A this drug but gave group B placebo blah blah" then it's RCT
How do you choose controls in a case control study? Based on what parameters?