This document provides an overview of case-control studies, including: - Case-control studies compare characteristics of people with a disease (cases) to people without the disease (controls) to identify potential risk factors. - Key components include clearly defining the disease, selecting representative cases and controls, measuring exposures that occurred before disease onset, and accounting for potential confounding factors. - The odds ratio is used to analyze if cases had higher or lower odds of exposure compared to controls, indicating increased or decreased risk.