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Chinese validation of the quality of life profile for spinal deformities (QLPSD).

We aimed to translate and validate the Quality of Life Profile for Spine Deformities (QLPSD), an age-specific tool assessing the individuals' health-related quality of life (HRQoL), into a Chinese version for adolescent individuals with adolescent idiopathic scoliosis (AIS). The Chinese version was translated from the original Spanish QLPSD following widely accepted guidelines and evaluated by both individuals with AIS and experts. 172 Chinese-speaking individuals between 9 and 18 years of age with Cobb angles between 20° and 40° were included. Internal consistency, test-retest reliability, and floor and ceiling effects were all analyzed. Convergent validity was evaluated by correlating the measures in the Chinese QLPSD with those in the 22-item Scoliosis Research Society Questionnaire (SRS-22). Known-groups construct validity was assessed by comparing the QLPSD scores of two groups of individuals divided by their Cobb angles. The internal consistency (total Cronbach's alpha = 0.917) and the test-retest reliability (total intra-class correlation coefficient = 0.896) were both satisfactory. The Chinese QLPSD correlated well with the SRS-22 in the total score and in relevant subscales (r = -0.572, p < 0.01). The questionnaire was able to differentiate between individuals with different Cobb angles. No floor or ceiling effects were shown in the total score, neither were there ceiling effects in the subscales, but floor effects were observed in four of the five subscales, between 20.0% and 45.7%. The Chinese version of the QLPSD shows adequate transcultural adaptation, reliability, and validity, and is useful as a clinical evaluation tool for the HRQoL of adolescent Chinese-speaking individuals with AIS.

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