Improvement in the quality of life of outpatients with severe mental illness in conjunction with intellectual disabilities and post-traumatic stress disorder.

Background: Elucidating the influence of mild intellectual disability (MID; IQ 50-70)/borderline intellectual functioning (BIF; IQ 70-85) and (comorbid) post-traumatic stress disorder (PTSD) on the quality of life of patients with serious mental illness (SMI) could improve their mental health care.

Method: This study comprises a prospective longitudinal cohort study using routine outcome monitoring data. The cohort comprised 601 patients who had undertaken at least one Manchester Short Assessment of Quality of Life (MANSA).