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Divides existing cases by the population examined to give point prevalence, expressed as a percentage, per 1,000 and per 100,000.
Prevalence
Prevalence = existing cases / population examined; odds = prevalence / (1 - prevalence)
In a steady state, prevalence is approximately incidence multiplied by average disease duration.
Point prevalence counts cases at one moment; period prevalence counts anyone with the condition during an interval.