Calculadora de Risco

The Risk Calculator is a statistical tool that determines the absolute risk of an event occurring in a cohort. Absolute risk is calculated by dividing the number of events by the total number of individuals at risk. For example, if in a group of 100 people, 20 develop a disease, the absolute risk is 20/100 = 0.20 or 20%. This metric is fundamental in epidemiology and clinical studies to quantify the probability of an outcome.

The operation is simple: enter the number of events (cases) and the total number of individuals in the cohort. The calculator divides events by total and displays the result as a decimal fraction, simplified fraction, and percentage. It may also provide a confidence interval if implemented. It is useful for researchers, health professionals, and students who need a quick estimate of the occurrence of an event in a defined population.

Use this calculator when you need to assess the incidence of a disease in an exposed group, the success rate of a treatment in a clinical trial, or the probability of an adverse event in a cohort. It is essential for comparing risks between groups, but remember that absolute risk does not account for follow-up time (for that, use incidence rate).

Caveats: ensure the data come from a closed cohort (no loss to follow-up) and that the event is well-defined. Absolute risk should not be confused with odds or relative risk. For rare events, absolute risk may be small but still relevant. Always interpret the result in the context of sample size and estimate precision.