The Adolescent/Young Adult Self-Management and Independence Scale (AMIS-II): Expanding evidence for validity and reliability.

Purpose: The purpose of this longitudinal study was to evaluate the internal consistency reliability and construct validity of the Adolescent/Young Adult Self-Management and Independence Scale-II (AMIS-II), an interview-based measure of self-management for youth with chronic health conditions.

Methods: A diverse sample of adolescents and young adults (AYA) with spina bifida (SB) (n = 64 AYA; mean 20.88; age range 18-25 years) completed an AMIS-II interview. Six years earlier, parents from 55 families completed questionnaires that assessed children's responsibility for SB-related care (Sharing of Spina Bifida Management Responsibilities) and their ability to perform skills across condition-related tasks (The Spina Bifida Independence Survey). Parents also reported on child's communication skills, adaptive behaviors, and independent management of finances (Adaptive Behavior Assessment System-Second Edition; Scales of Independent Behavior-Revised). Descriptive and correlational analyses were conducted to assess the construct validity and the internal consistency reliability of the AMIS-II.

Results: The AMIS-II demonstrated excellent internal consistency reliability (AMIS-II total scale α= 0.95; subscales α= 0.90 -0.91). Evidence in support of construct validity was found in associations between the AMIS-II and measures of child responsibility for SB-related care, ability to perform condition-related skills, and adaptive behaviors (r's = 0.378 -0.777; p's < 0.05).

Conclusion: This study provides further evidence of strong reliability and validity for the AMIS-II. Additional research with this measure will facilitate a better understanding of factors related to self-management behaviors in adolescents and young adults with spina bifida.