What is prevalence?

Prevalence quantifies the proportion of individuals in a population who have a disease during a specific time period, while incidence refers to the number of new cases of disease that develop in a population during a specific time period. In disorders of short duration, incidence and prevalence rates may be similar, however with disorders of long duration such as with bipolar disorder there can be variation between the two. Point prevalence is the proportion of individuals who manifest a disorder at a given point in time, period measures the proportion of individuals who manifest a disorder during a specified period (e.g. one year), lifetime is the proportion of individuals in the population who have ever manifested a disorder who are alive on a given day and lifetime morbid risk also includes those deceased at the time of the assessment.

What is the worldwide prevalence of bipolar disorder?

Moderate to high quality evidence suggests the lifetime worldwide prevalence for bipolar disorder is around 1%, and the one-year prevalence is around 0.5%. Rates were higher for bipolar I disorder than for bipolar II disorder.

June 2020

Last updated at: 4:35 am, 23rd June 2020
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