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Epidemiology is the study of the distribution and determinants of diseases or states in population groups and the application of …

According to Rothman: Any event, act, or condition preceding disease or illness without which disease would not have occurred or …

Epidemic is the unusual occurrence in a community or region of disease, specific health-related behavior (e.g. smoking) or other health …

What is Bias? An error in sampling or testing that systematically under- or over-represents one outcome (answer) over the other. …

Spurious Association Sometimes an observed association between a disease and suspected factor may not be real. For example a study …

Quasi experimental designs are based on the same structure as experimental designs but lack the randomization, control, or both. These …

Trial is from the French ‘trier’ (to try). Trial may be: • Clinical trial –in which we apply therapeutic interventions …

An epidemiological experiment in which subjects in a population are randomly allocated into groups, usually called study and control groups …

Cohort is an ancient Roman military unit of 300-600 men, a group of soldiers marching forward in battle. Cohort studies …

The differences between case control and cohort studies may be summarized as follows: Case Control Study Cohort Study • Proceeds …