Prevalence

Prevalence is the proportion of a population found to have a condition (typically a disease or a risk factor such as smoking). It is calculated by comparing the number of people found to have the condition with the total number of people studied, and is usually expressed as a fraction (for example, 1/3), as a percentage (%) or as the number of cases per 10,000 or 100,000 people.

Prevalence can be measured at a particular point in time (point prevalence), or over a specified period such as a year (period prevalence).

Glossary: Cross-Sectional Study
Glossary: Rare disease
Epidemiologic concepts: incidence and prevalence
Epidemiology is the underlying and basic science of public health. It could be defined as any research of health events in populations, including: how many are affected by such events, is the risk increasing or decreasing, what is the relevance of the problem and how could it be prevented.
Prescribing medicines for special populations
Special considerations are necessary when prescribing medicines in special populations, such as children, the elderly, pregnant and breastfeeding women, and patients with renal (kidney) or hepatic (liver) impairment.
EMA Committees: Committee for Orphan Medicinal Products (COMP)
The EMA Committee for Orphan Medicinal Products (COMP) reviews applications for orphan-medicinal-product designation.

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