II. Definition

  1. Number of current cases per population at risk
    1. Old: Persistent active disease contracted previously
    2. New: Onset of active disease
  2. Point Prevalence
    1. Prevalence at a specific point in time
  3. Period Prevalence
    1. Prevalence over a given time interval

III. Usage

  1. Measure amount of illness in the community
  2. Determine health care needs of the community

IV. Contributing factors

  1. Disease Incidence Rate
  2. Illness Duration

V. References

  1. Hennekens (1987) Epidemiology Medicine, p.54-98

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