Biostatistics
Lessons
Illustrated, high-yield walkthroughs of the biostatistics concepts the boards test most.
A tight, boards-focused walkthrough of the diagnostic 2×2 table: sensitivity and specificity as prevalence-independent test properties versus PPV/NPV as prevalence-dependent patient answers, plus cutoff trade-offs, likelihood ratios, ROC/AUC, and the SnNOUT/SpPIN rules.
A board-focused walkthrough of hypothesis testing: how to read a p-value against α, the Type I/II error truth table, power, and confidence-interval rules — with vignettes drilling the classic p-value misinterpretation and underpowered-study traps.
A Step 1-focused lesson on interpreting confidence intervals (crossing 0 for difference measures, 1 for ratios) and recognizing statistical power, Type I/II error, and the underpowered \"negative\" study.
A board-focused walkthrough of the five core risk measures — RR and OR (measures of association, chosen by study design) and ARR, RRR, and NNT (measures of clinical impact) — built from the 2×2 table, with worked case-control and RCT vignettes plus confidence-interval interpretation.
A high-yield STEP 1 lesson distinguishing incidence (new cases, risk, acute disease, causation) from prevalence (all existing cases, burden, chronic disease), anchored on P ≈ I × D and the classic board traps of prolonged-survival treatments raising prevalence while vaccines lower incidence first.
A boards-focused framework for picking the right statistical test by outcome-variable type (mean vs. proportion), number of groups, and paired vs. independent design — covering the t-test, ANOVA, chi-square, correlation, linear/logistic regression, and their non-parametric counterparts.
A high-yield Step 1 lesson on correlation vs. regression: interpreting the correlation coefficient r, the causation trap, r² as variance explained, and choosing linear vs. logistic regression. Built around the exact interpretation errors the boards test.
A boards-focused walkthrough of Kaplan-Meier survival curves — reading the step function, censoring, median survival, the log-rank test, and Cox-derived hazard ratios, with vignettes on median-survival and HR interpretation.
FAQ
What's covered in the Biostatistics topic?
Biostatistics 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 Biostatistics have?
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Is Biostatistics on USMLE Step 1 or Step 2 CK?
Biostatistics 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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