Reliability and validity of the SPAID-G checklist for detecting psychiatric disorders in adults with intellectual disability

► We produced a new screening tool for psychiatric disorders in people with intellectual disability. ► We examined psychometric characteristics of it and score prevalence in a multicentric Italian sample. ► Correlation with other evaluation tools, internal consistency, and inter-rater reliability result to be good. ► Autistic spectrum, impulse control, and mood are most frequent disorders. ► SPAID-G seems to be a valid screening tool, quick and easy to use.