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Epidemiological Studies
Research investigations conducted to understand the patterns, causes, and effects of health and disease conditions in defined populations.
Prevalence
The percentage of individuals in a population who are identified as having a certain condition during a particular time frame.
Incidence
The rate at which new cases of a disease or condition appear over a certain period of time, typically per year.
Placebo Control Group
In a therapy outcome study, group of people whose treatment is an inactive substance (to compare with the effects of a drug) or a nontheory-based therapy providing social support (to compare with the effects of psychotherapy).
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