Prevalence in psychiatric patients

What is prevalence?

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 (e.g., at one-month post-trauma), while period prevalence is the proportion of individuals in a population who have the disorder over specific time periods (e.g., one to two months post-trauma). 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 evidence for the prevalence of PTSD in psychiatric patients?

Moderate quality evidence found the mean prevalence of PTSD in specialist mental health services was around 31%, with around 27% being previously undetected.

Moderate quality evidence finds the prevalence of PTSD diagnosis in first-episode psychosis patients is around 30% up to 2 years after the first episode of psychosis. Prevalence of PTSD symptoms was reported in 42% of first-episode patients. Rates were highest in people with first-episode affective psychosis and in hospitalised patients.

August 2021

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Last updated at: 4:02 am, 4th August 2021
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