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Patients who have intellectual disability and mental illness will occasionally need inpatient treatment. However, research is sparse on psychosocial factors influencing psychiatric units for patients with intellectual disabilities. The aim of this study is to examine whether adults with intellectual disabilities can reliably rate the Ward Atmosphere Scale – Real Ward (WAS‐R).

A total of 17 patients with mild and moderate intellectual disability and 21 staff members were asked to complete the WAS‐R. The authors used six subscales (involvement, support, practical orientation, order and organisation, angry and aggressive behaviour, and staff control) that have proved to be of major importance for patient satisfaction and treatment outcome to measure the patients' and the staff members' perceptions of the treatment milieu. To examine the internal consistency Cronbach's alpha was calculated for the patient and staff scores, respectively.

A total of 16 patients completed the form. Patients with mild intellectual disabilities were able to answer the WAS with some help, whereas patients with moderate intellectual disabilities had major difficulties with understanding more than half of the WAS items. These difficulties were also reflected in the internal consistency scores. Cronbach's alpha was satisfactory (≥0.50) for five subscales for patients with mild intellectual disabilities, but only satisfactory for two of the six subscales for patients with moderate intellectual disabilities.

A replication study should use a shorter version of the WAS‐R, and family or caregivers should answer the WAS‐R additionally to the patients.

This study may encourage more research on treatment milieu for patients with intellectual disability and mental illness.