Test-Retest Reliability and Internal Consistency of Cerebral Palsy Quality of Life Questionnaire (Thai version)

Cerebral palsy (CP) is a common physical disability in children. The incidence has been estimated as 2–2.5 per thousand live births.  Measuring quality of life (QOL) is a part of assessing the health condition of children with CP.  The Cerebral Palsy Quality of Life for Children (CP QOL-Child) is a condition-specific QOL measure for children with CP which that the CP QOL-Child did not have formal translation into Thai language, and deserves reliability study.  The aims of this study were to cross-culturally translate and examine reliability and internal consistency of CP QOL-Child questionnaire (Thai version).  The authors conducted cross translation of the CP-QOL-child questionnaires based on the original authors’ translation guidelines.  The primary caregiver proxy form of the CP QOL-Child was developed for primary caregivers of children with CP aged 4–12 years (66 items).  The child self-report form was for children with CP aged 9–12 years (52 items ). For study of test–retest reliability and internal consistency of the CP-QOL child (Thai version), 30 primary caregivers and 30 children with CP were asked to complete the questionnaire and re-answer in two weeks later.  Intraclass correlation coefficient (ICC) was used to examine test–retest reliability at the domain level.  Internal consistency was estimated using Cronbach’s alpha. Excellent test-retest reliability and internal consistency were obtained.  All intraclass correlation coefficients were above 0.7.  Cronbach’s alpha coefficients were between 0.76 and 0.91.