Polish Adaptation of the Italian Spine Youth Quality of Life Questionnaire

Edyta Kinel; Krzysztof Korbel; Piotr Janusz; Mateusz Kozinoga; Dariusz Czaprowski; Tomasz Kotwicki

doi:10.3390/jcm10102081

Polish Adaptation of the Italian Spine Youth Quality of Life Questionnaire

J Clin Med. 2021 May 12;10(10):2081. doi: 10.3390/jcm10102081.

Authors

Edyta Kinel¹, Krzysztof Korbel², Piotr Janusz³, Mateusz Kozinoga³, Dariusz Czaprowski^{2

4}, Tomasz Kotwicki³

Affiliations

¹ Department of Rehabilitation, University of Medical Sciences in Poznan, 61-545 Poznan, Poland.
² Department of Physiotherapy, University of Medical Sciences in Poznan, 61-545 Poznan, Poland.
³ Department of Spine Disorders and Pediatric Orthopedics, University of Medical Sciences in Poznan, 61-545 Poznan, Poland.
⁴ Department of Health Sciences, Olsztyn University, Bydgoska 33, 10-243 Olsztyn, Poland.

Abstract

The study aimed to carry on the process of the cultural adaptation of the Italian Spine Youth Quality of Life Questionnaire (ISYQOL) into Polish (ISYQOL-PL). The a priori hypothesis was: the ISYQOL-PL questionnaire is reliable and appropriate for adolescents with a spinal deformity. Fifty-six adolescents (mean age 13.8 ± 1.9) with idiopathic scoliosis (AIS) with a mean Cobb angle 29.1 (±9.7) and two with Scheuermann juvenile kyphosis (SJK) with a kyphosis angle 67.5 (±17.7) degrees were enrolled. All patients had been wearing a corrective TLSO brace for an average duration of 2.3 (±1.8) years. The Institutional Review Board approved the study. The cross-cultural adaptation of the ISYQOL-PL was performed following the guidelines set up by the International Quality of Life Assessment Project. The reliability was assessed using internal consistency (the Cronbach's alpha coefficient) and test-retest reliability (intraclass correlation coefficient ICC_2.1, CI = 95%); moreover, floor and ceiling effects were calculated. The internal consistency was satisfactory (Cronbach's alpha coefficient 0.8). The test-retest revealed high reliability with the value of ICC_2.1 for the entire group 0.90, CI (0.84 to 0.94). There was neither floor nor ceiling effect for the ISYQOL-PL overall score. The ISYQOL-PL is reliable and can be used in adolescents with spinal deformity.

Keywords: Italian Spine Youth Quality of Life Questionnaire; cultural adaptation; health-related quality of life; idiopathic scoliosis.