ABSTRACT
Background
This report describes the preliminary psychometric evaluation of the Diagnostic Interview for Adolescents and Adults with Intellectual Disability: An interview schedule of mental disorders (DIAAID), an accessible structured interview for individuals with intellectual disability.
Method
We examined test–retest reliability, inter-rater reliability, and concordance between direct and other-informant reports.
Results
Intraclass correlations (CCs) for test–retest ranged from good to poor (ICC 0.79–< 0.50). ICCs for inter-rater reliability revealed excellent to moderate reliability between two independent raters (ICC 1.00–0.65). Percent agreement was high for positive and negative diagnoses between adolescent/adult participants (AAPs) and study partner participants (SPPs) (87.7%–100%) and between two raters of the same direct-report interview (90.9–100). Although SPPs endorsed more symptoms than AAPs, AAPs endorsed some that SPPs did not, with poor agreement between direct and informant reports (ICC −0.01 to 0.30).
Conclusion
Preliminary psychometric findings are promising though not compelling. The direct report detects symptoms not noted by the caregiver.