The instrument was validated by 236 North American adolescents 12 to 18 years of age with and without impairment. The validity of the construct with the KINDL® Children quality of life questionnaire attained a correlation of 0.73, indicating a significant association between the 2 methods. Internal consistency, measured using Cronbach’s alpha, ranged from0.77 to 0.96, and reproducibility was measured with the intra-class correlation coefficient, ranging from 0.74 to 0.85.
El instrumento ha sido validado para 236 adolescentes norteamericanos de 12 a 18 años con y sin discapacidad, la validez de constructo con el KINDL® Children quality of life questionnaire, obtuvo una correlación de .73, indicando significativa asociación entre las dos medidas, la consistencia interna mediante alfa de Cronbach .77 a .96 y la reproducibilidad con el coeficiente de correlación intra clase .74 a .85.