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Original

Community mobility assessment for adolescents with an acquired brain injury: Preliminary inter-rater reliability study

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Pages 205-211 | Received 11 Apr 2006, Accepted 18 Jul 2006, Published online: 10 Jul 2009
 

Abstract

Background: The Community Mobility Assessment (CMA) is an observational assessment that evaluates safety of an adolescent with an acquired brain injury (ABI) during a community outing. It consists of a 3-point level of accomplishment scale for 40 functional items, divided into two components (physical and cognitive). The CMA identifies areas of strength and weakness and facilitates development of compensating strategies. This study was undertaken to determine how reliably therapists rate a client's performance using the CMA on a community outing.

Participants: Eight adolescents between the ages of 12 and 18 participated. All had an ABI and were involved in rehabilitation either as a day-patient or inpatient.

Methods: Each teen was independently evaluated by one expert rater and one of two student raters (A or B), using the CMA during a standard 2-h community outing.

Analysis: Descriptive statistics were computed for physical and cognitive component summary scores. Inter-rater reliability analyses used weighted Kappa statistics. A minimum Kappa score >0.70 was hypothesized a priori to indicate good reliability.

Results: The mean score for the physical component = 92% (min = 82%, max = 100%), and for the cognitive component = 77% (min = 58%, max = 97%). Minimum weighted Kappa scores for the two rater pairings were 0.80 for the physical component and 0.70 for the cognitive component.

Conclusions: An acceptable Kappa score was reached for both components, indicating that with appropriate rater training, the CMA has good inter-rater reliability. Construct validity and responsiveness to change over a clinically meaningful follow-up period should now be evaluated.

La CMA es una evaluación observacional que evalúa la seguridad que tiene el adolescente con ABI durante un paseo comunitario. Consiste en una escala de logros de un nivel de tres puntos para 40 ítems funcionales dividida en dos componentes (físico y cognitivo). La CMA identifica áreas de fortaleza y de debilidad, y facilita el desarrollo de estrategias de compensación. Este estudio fue tomado para determinar que tan confiable califican los terapistas el desempeño del paciente usando la CMA en un paseo comunitario.

Participantes: Participaron 8 adolescentes con edades entre los 12 y los 18 años. Todos tuvieron ABI y realizaban rehabilitación ya sea en forma externa o interna.

Métodos: Cada joven fue evaluado en forma independiente por un calificador experto y uno de dos calificadores estudiantes (A ó B) usando el CMA, durante un paseo comunitario con una duración de dos horas estándar.

Análisis: Las estadísticas descriptivas fueron computadas por las calificaciones resumidas de componentes físico y cognitivo. El análisis de confiabilidad inter-rater utilizó estadísticas apoyadas en Kappa. Una calificación Kappa mínima > 0.70 fue hipotetizada a priori para indicar una buena confiabilidad.

Resultados: La calificación promedio para el componente físico = 92% (min = 82% máx = 100%) y para el componente cognitivo = 77% (min = 58%, máx = 97%). Las calificaciones mínimas apoyadas en Kappa para los dos pareos de tasa fueron 0.80 para el componente físico y 0.70 para el componente cognitivo.

Conclusiones: Ambos componentes alcanzaron una calificación de Kappa aceptable, indicando esto que con un entrenamiento apropiado el CMA tiene una buena confiabilidad inter-rater. La construcción de una validez y la capacidad de respuesta al cambio a lo largo de un período de seguimiento clínico significativo deberán ahora ser evaluadas.

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