cohort study

Syllable breakdown

Dictionary meaning

an observational epidemiological study design in which a defined group of people — the cohort — who share a common characteristic or experience are followed over time to measure the incidence of disease, health outcomes, or other events of interest, enabling the comparison of outcomes between exposed and unexposed sub-groups within the cohort; prospective cohort studies follow participants forward in time from a defined baseline, while retrospective cohort studies reconstruct past exposures and outcomes from existing records; cohort studies are particularly valuable for studying the natural history of disease, identifying risk factors, and estimating relative risks and attributable fractions; their strengths include clear temporal ordering of exposure before outcome and the ability to study multiple outcomes simultaneously, while their limitations include cost, duration, attrition, and the inability to control for unmeasured confounders