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Point Prevalence Rates - obtained by conducting a prevalence or cross-sectional study
Period Prevalence Rates
- number or rate of cases found during a specific time period, one or more years. Not used as often as point prevalence

Disability: (as defined by the World Health Organization)
Impairment
- any loss or abnormality of psychological, physiological or anatomical structure or function;
Disability
- a restriction or lack (resulting from an impairment) of ability to perform an activity in the manner or within the range considered normal for a human being;
Handicap
- a disadvantage for a given individual, resulting from an impairment or a disability, that limits or prevents the fulfillment of a role that is normal (depending on age, sex, and social and cultural factors) for that individual.

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