Core Revision
AKT & MSRA · StatisticsThe AKT Statistics Guide
From p-values to practice — the core statistics the exam tests, explained simply, with short video tutorials woven in. Read the chapter, watch the video where there is one, then drill the questions.
In the AKT you don’t need to be a mathematician — you need to be a BS detector. Sixteen chapters across five parts take you from describing data to reading a forest plot, each with worked examples, the exam’s favourite traps, and an AKT-style question to test yourself. Where there’s a video, it’s embedded right in the chapter.
Averages: Mean, Median & Mode
Choosing the right average, and why skew makes the mean lie.
Standard Deviation vs Standard Error
Spread of your patients versus precision of the mean — and SE = SD/√n.
Incidence vs Prevalence
New cases versus everyone living with it — the bath analogy.
Confidence Intervals
Precision, width, and when crossing 1 or 0 means “not significant”.
Study Design
RCT, cohort, case-control — the hierarchy and what each can show.
Bias & Validity
Selection, recall, attrition, lead-time and length-time bias.
Sensitivity & Specificity
SnNOUT / SpPIN, and the 2×2 table that solves everything.
The Prevalence Trap: PPV & NPV
Why a great test gives mostly false positives in primary care.
Likelihood Ratios & the Fagan Nomogram
One number that turns a result into a change in probability.
Screening Principles
Wilson & Jungner, plus lead-time and length-time bias.
Risk & Reward: ARR, RRR & NNT
Why a “50% reduction” can be almost nothing.
Number Needed to Harm
Weighing benefit against harm — and why a bigger NNH is safer.
Hazard Ratios & Kaplan–Meier Curves
Reading survival curves and what an HR actually summarises.
Odds Ratios & Regression
Why case-control gives an OR, and when an OR overstates risk.
Forest Plots & Meta-Analysis
Anatomy of a forest plot, heterogeneity and the diamond.
Stats Cheat-Sheet
Every formula, mnemonic and magic number on one page — for the night before.
by Core Revision · corerevision.comThe other free AKT guide
The Ethics, Law & Safeguarding Guide covers the other half of the medico-legal syllabus — capacity, consent, confidentiality, safeguarding and the Mental Health Act — in eleven interactive chapters, updated for the June 2026 Supreme Court ruling on deprivation of liberty. Free, no account needed.