Epidemiology is a ________-based science.

• A. Population-based
• B. Laboratory-based
• C. Individual patient-based
• D. Clinician-based

Answer: (A)

Epidemiology is a population-based science. It focuses on how diseases and health outcomes are distributed across groups, communities, and entire populations rather than on a single patient. By examining patterns of incidence and prevalence over time, across places, and among different demographic groups, epidemiologists identify risk factors, monitor trends, and assess interventions at a public health level. This population focus lets findings be applied to broad groups and informs policy and prevention efforts. In contrast, laboratory-based work centers on experiments in a lab setting, and an individual patient-based or clinician-based approach concentrates on diagnosis and treatment of single individuals rather than population patterns.