Research Methods
Lessons
Illustrated, high-yield walkthroughs of the research methods concepts the boards test most.
A board-focused walkthrough of the core epidemiology triad: matching each study design to its correct measure of association (OR, RR, prevalence), recognizing the classic biases, and distinguishing confounding from effect modification.
A Step 1 high-yield lesson on randomized controlled trials covering randomization, allocation concealment, blinding levels, the evidence hierarchy, trial phases, and analysis methods, with classic vignettes on intention-to-treat and crossover designs.
A board-focused breakdown of the two core observational designs — cohort (group by exposure → follow forward → relative risk) versus case-control (group by disease → look backward → odds ratio) — with 2×2 setup, worked OR/RR computations, and the biases Step 1 loves to test.
A board-focused breakdown of confounding versus effect modification, built around the stratified-analysis test used to distinguish them, with classic vignettes (coffee–cancer confounded by smoking; OCP–MI modified by smoking) and explicit next-best-step decisions.
A Step 1 high-yield lesson distinguishing validity (accuracy; freedom from systematic error/bias) from reliability (precision; freedom from random error), anchored by the dartboard model and next-best-step vignettes on instrument calibration and inter-rater agreement.
Bradford Hill's nine criteria are viewpoints — not a checklist — for judging whether an exposure–outcome association is causal. Board essentials: temporality is the only required criterion, dose–response and strength argue strongly for causation, and specificity is weakest — and chance, bias, confounding, and reverse causation must always be excluded first.
A board-focused walkthrough of the drug-development pipeline: preclinical testing plus the four clinical trial phases, emphasizing the subject population, sample size, and core question that distinguishes each phase on Step 1 vignettes.
How the boards test systematic reviews and meta-analysis: reading a forest plot (does the CI/diamond cross the line of no effect?), interpreting I² heterogeneity and fixed-effect vs random-effects models, and recognizing funnel-plot asymmetry as publication bias.
FAQ
What's covered in the Research Methods topic?
Research Methods covers high-yield mechanisms, clinical presentations, diagnostic workup, and management — drawn from First Aid, Pathoma, and the NBME content outline.
How many practice questions does Research Methods have?
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Is Research Methods on USMLE Step 1 or Step 2 CK?
Research Methods appears on both Step 1 (foundational mechanisms) and Step 2 CK (clinical decision-making). Our questions are tagged by exam target so you can filter to just the Step you're studying.
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