| A | B |
| Epidemiology | The study of the distribution and determinants of health related states in specific populations, and the application of this study to control health problems |
| Descriptive Epidemiology | The characterization of health events in terms of time, place, and person (Who, what, were, when) |
| Analytical Epidemiology | The type of epidemiology that attempts to search for the causes or factors that are associated with increased risk or probability of disease (How and why) |
| Applied (or field) epidemiology | The name for a type of epidemiology in which epidemiologic data steers public health decisions |
| Experimental study | A type of epi study in which the epidemiologist has control over the circumstances |
| Observational Study | A type of epidemiologic study in which the epidemiologist does not have control over the circumstances |
| Cross-sectional Study | A study in which the population is defined, then information is collected about the disease and exposure status of the members |
| Cohort (Prospective) Study | A study in which the population is chosen according to their exposure, regardless of whether they have the disease or not |
| Case-Control (Retrospective) Study | A study in which the population Is chosen based on the presence (case) or absence (control) of the disease. |
| Relative Risk defined | Relationship between exposure and outcome in a cohort study. Greater than 1= more than expected risk |