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Epidemiology
100
The foundation of public health is the study that aids in the understanding of the nature, extent, and cause of public health problems and provides essential information for improving people's health and social conditions. 

Epidemiology

200

Characterization of the distribution of health-related states or events. 

Descriptive epidemiology

300

Involves finding and quantifying associations, testing hypotheses, and identifying causes of health-related states or events. 

Analytic Epidemiology

400

A specific event, condition, or characteristic that precedes the health outcome and is necessary for its occurrence. 

Cause

500

A behavior, environmental exposure, or inherent human characteristic that increases the chance of developing an adverse health outcome. 

Risk Factor