Prevalence represents the overall proportion of individuals in a population who have the disorder of interest. It is different from incidence, which represents only the new cases that have developed over a particular time period. Point prevalence is the proportion of individuals who have the disorder at a given point in time. Period prevalence is the proportion of individuals who have the disorder over specific time periods. Lifetime prevalence is the proportion of individuals who have ever had the disorder. Lifetime morbid risk also includes those who had the disorder but were deceased at the time of the survey.

What is the evidence for the prevalence of PTSD in elderly people?

Moderate quality evidence finds the 12-month prevalence rate of PTSD in older adults (≥65 years) is 1.56%, and the lifetime prevalence rate of PTSD in older adults is 2.66%. Lifetime prevalence rates of PTSD are nearly twice as high in women than in men.

The prevalence rate of PTSD in older prisoners (≥50 years) is 6.2%. Prevalence of PTSD in older US veterans (≥65 years) is 8.4%. The prevalence of PTSD in older adults (≥65 years) after a fall is 27.5%, which represents a small, significant increase in risk of PTSD when compared to older people with no previous fall.

August 2021

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Prevalence quantifies the proportion of individuals in a population who have a disorder during a specific time period, while incidence refers to the number of new cases 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 bipolar disorder, there can be variation between the two. Current, or ‘point’ prevalence is the proportion of individuals who have the disorder at a given point in time, ‘period’ prevalence measures the proportion of individuals who have the disorder during a specified period (e.g. 1 year), a ‘lifetime’ prevalence is the proportion of individuals in the population who have ever had the disorder.

What is the evidence on prevalence of bipolar disorder in elderly people?

Moderate to high quality evidence finds the current prevalence of bipolar spectrum disorders in elderly people in Canada and France is around 0.5%, and the lifetime prevalence of bipolar spectrum disorders in elderly people in Canada and the USA is around 1%. No reviews were identified that assessed rates in elderly people in other regions.

Moderate quality evidence finds the current prevalence of bipolar disorder in elderly veterans is around 4%, and moderate to high quality evidence finds the current prevalence of bipolar disorder in older prisoners is around 4.5%.

October 2021

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Prevalence represents the overall proportion of individuals in a population who have the disorder of interest. It is different from incidence, which represents only the new cases that have developed over a particular time-period. Point prevalence is the proportion of individuals in a population who have the disorder at a given point in time, while period prevalence is the proportion of individuals in a population who have the disorder over specific time periods. Lifetime prevalence is the proportion of individuals in a population who have ever had the disorder and lifetime morbid risk also includes those who had the disorder but were deceased at the time of the survey.

What is the prevalence of schizophrenia in elderly people?

Moderate to high quality evidence finds the overall prevalence of schizophrenia and other psychotic disorders in older prisoners (>50 years) is around 5.5%. Moderate quality evidence suggests the prevalence of schizophrenia in elderly men who attempted suicide is also around 5%, which is substantially lower than the prevalence of mood disorders (42%) or substance use disorders (41%) in this population.

April 2022

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