Screening for intellectual disabilities and borderline intelligence in Dutch outpatients with severe mental illness.

Background: The reliability and validity of the Screener for Intelligence and Learning Disabilities (SCIL) are unknown in a population of outpatients with severe mental illness. The prevalence of mild or borderline intellectual disabilities (MBID); an umbrella term for people with borderline intellectual functioning (BIF) and mild intellectual disability (MID) in this population is also unknown.

Methods: A total of 625 patients were screened with the SCIL, 201 of which also had IQ test results.