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Introduccion: La cooperacion es un elemento relevante para el exito terapeutico en procesos de ortodoncia. En el caso particular de los adolescentes, conocer su grado de cooperacion permite al ortodoncista considerar, en la planeacion de la intervencion, comportamientos y actitudes que contribuyan a los propositos del tratamiento. Objetivo: Analizar las evidencias de validez de la medida de cooperacion del paciente ortodoncico, propuesta por Slakter, Albino, Fox y Lewis, siguiendo los lineamientos de Wolfe y Smith. Metodos: Estudio de validacion anidado en un diseno de cohortes en el cual se siguieron, entre enero del 2014 y noviembre del 2015, 132 adolescentes pacientes activos de tratamiento de ortodoncia correctiva residentes de la ciudad de Medellin. Se estimaron las locaciones y estadisticos de ajuste de los items, confiabilidad, unidimensionalidad y funcionamiento diferencial por caracteristicas clinicas y demograficas de los participantes. Se presenta el mapa de Wright. Resultados: Cuatro items fueron eliminados de la escala. A partir de los seis restantes se obtuvo una medida con una confiabilidad de .74 y capacidad para explicar el 74.9% de la varianza. Se identifico funcionamiento diferencial de los items segun tipo de maloclusion y segun antecedente de ortodoncia interceptiva. Conclusion: La validez de la medida se ve afectada por limitaciones en la generalizacion del constructo segun caracteristicas clinicas relevantes de los adolescentes. Palabras clave : Cooperacion del Paciente, Ortodoncia, Paciente Ortodoncico, Tratamiento Ortodoncico, Actitudes, Adherencia del Paciente, Cooperacion, Escala de Cooperacion del Paciente Ortodoncico, Adolescente, Estudio de Validacion. Abstract Introduction: Cooperation is a relevant therapeutic factor in achieving a successful orthodontic treatment result. In the case of adolescents, knowing cooperation level allows the orthodontist to consider behaviors and attitudes that contribute to treatment purposes. Objective: To Analyze the evidence of validity that measures collaboration in the orthodontic patient proposed by Slakter, Albino, Fox and Lewis in accordance with Wolfe and Smith´s guidelines. Methods: Validation study nested in a cohort study in which 132 adolescent patients under orthodontic treatment in Medellin Colombia were monitored between January 2014 and November 2015. It was estimated the locations and statistics for the adjustment of items, reliability, one-dimensionality and differential functioning by clinical and demographic characteristics of the participants. Wright's map is introduced. Results: Four items were removed from the scale. From the remaining six, a measure was obtained with a reliability of 0.74 and the capability to explain 74.9% of the variance. Differential functioning of the items was identified by type of malocclusion and interceptive orthodontic history. Conclusion: The validity of the measure is affected by limitations in constructing generalization according to relevant clinical characteristics of adolescents. Keywords : Patient Compliance, Orthodontics, Orthodontic Patient, Orthodontic Treatment Attitudes, Patient Adherence, Cooperation, Cooperation Scale, OPCS, Adolescent, Validation Studies, Rasch Models.

Análisis Rasch de la medida de cooperación del paciente ortodóncico en adolescentes de Medellín