Irena Dychawy-Rosner

Interrater Reliability and Construct Validity—An Investigation of the IDA Assessment

To support planning in habilitation/rehabilitation interventions with the mentally retarded, the IDA (Irena Daily Activity Model—the working model for day activities centre) assessment was developed as a method for a general occupational functioning assessment. This study was designed to examine the reliability and construct validity of the IDA assessment, which were evaluated in terms of interrater reliability and convergent validity. The IDA was applied in two random samples consisting of 6 patients each: 5 men and 7 women, a total of 12 attendees at two different day activity centres for people with developmental disabilities and mental retardation. Interrater reliability was measured by comparing the IDA measurements obtained by 6 raters at each unit (n = 12), who rated each subject independently on the IDA scale. Kappa as value of agreement was calculated and gave a value of k = 0.71 in the assessment of the performance areas of mobility-sensory motor components. This corresponds to a good agreement....