Putting "ME" into measurement: Adapting self-report health measures for use with individuals with intellectual disability.

BACKGROUND:Self-report is important for measuring health outcomes; however, most research in intellectual disability (ID) relies on proxy report. The lack of cognitively accessible measures is one barrier to accurate self-reporting by individuals with ID. AIMS:This paper describes the process of adapting self-report measures of health status, health-related quality of life, and environment for use by individuals with ID and presents evidence on their usability (accessibility), usefulness (independent self-report), and reliability (internal consistency and test-retest). METHODS AND PROCEDURES:We used an inclusive research approach, in which we collaborated with adults with ID to revise, cognitively test, and pilot test cognitively accessible self-report measures. Technology supported the independent completion of measures. We assessed usability, usefulness, and reliability of these measures in 41 adults with ID. OUTCOMES AND RESULTS:The resulting measures are useful (independently completed) and usable (elicit a range of responses), with modest reliability (internal consistency and test-retest). CONCLUSIONS AND IMPLICATIONS:Self- report by adults with ID is feasible. A key element of this measure adaptation process was engaging adults with ID. More research is needed to understand the reliability and validity of the adapted measures and the characteristics of the population for whom they are most usable.