The field of epidemiology is:

• A. A single-discipline field
• B. Multidisciplinary and interdisciplinary; focusing on patterns, trends and causes
• C. Focused only on clinical trials
• D. Only concerned with mortality

Answer: (B)

Epidemiology is a field that brings together methods and ideas from many disciplines to study health in populations. It is multidisciplinary and interdisciplinary, drawing on statistics to describe patterns, biology to understand mechanisms, social sciences to examine determinants like behavior and inequality, environmental health to consider exposures, and public health practice to apply findings. The focus is on patterns, trends, and causes of health-related states or events in groups, not on a single disease or on clinical trials alone. It asks who is affected, where, and when, and why— looking at distribution by person, place, and time and striving to identify risk factors and causal relationships. It also uses a range of study designs, from observational to experimental, and relies on surveillance data to monitor disease burden. Mortality is just one possible outcome; epidemiology also studies morbidity, risk factors, and prevention.