Study Designs for the USMLE

The best biostats you've ever seen for the USMLE.
Covered in this video: Cross-sectional, cohort, case-control, randomized-controlled trial (RCT), crossover study, case series, ecological, prevalence, incidence, correlation, causation, exposure, control, case, risk factor, relative risk (RR), retrospective, prospective, confounding, odds ratio, treatment, placebo, single-blinding, double-blinding, random assortment, washout period, population, individual, group factors, ecological fallacy
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[@Razannnxo]

why isn't the question at 11:20 considered an ecologic study? Since it is comparing 2 populations (city A & city B) and both study designs have the potential to find the prevalence and correlation. I don't get the difference between cross-sectional and ecologic study at this particular Q. kindly clarifyy :)

[@Goljian]

Thank you 🙏

[@dailydoseofmedicinee]

👏👏