Statistics · Module 13 · Statistics in health science: risk, odds and screening tests

Health Statistics Walkthrough

Prevalence: what fraction of a population has the condition at one point in time? It counts all existing cases , old and new. prevalence = existing cases / total population
Incidence: how fast do new cases appear? It counts only new cases over a period, among people who could still get it (the population at risk ). incidence = new cases / population at risk (per time)

Watch icon arrays of real-looking people turn into the numbers that nurses, doctors and public health teams use every day: prevalence and incidence, risk, relative risk and odds ratios, number needed to treat, sensitivity, specificity and predictive values, study designs, confounding and forest plots. Go at your own pace. Nothing here is graded.

Speed

Think of it like this

Quick check

Wrong answers are fine here. Read why, then try again.