Reliability and Validity of the Turkish Version of Early-Onset Scoliosis Self-Report Questionnaire

Objective: Early-Onset Scoliosis Self-Report Questionnaire (EOSQ-SELF) is a recently developed self-reported questionnaire based on the widely adopted Early-Onset Scoliosis Questionnaire and evaluates health-related quality of life in children with early-onset scoliosis over 8 years of age. To date, the questionnaire does not have a validated version in Turkish. The aim of this study was to translate EOSQ-SELF into Turkish and evaluate its reliability and validity.

Methods: Content validity was assessed through the item (I-CVI) and scale (S-CVI) content validity indices. The distribution of survey responses was analyzed and ceiling and floor effects were calculated with descriptive statistics. Internal consistency was measured with the Cronbach alpha coefficient. Construct validity was evaluated by comparing the responses between EOSQ-SELF and Scoliosis Research Society questionnaire-22 revised.

Results: Eighty-five patients (30 males and 55 females) diagnosed with early-onset scoliosis completed the EOSQ-SELF questionnaire. The I-CVI for the relevance of 30 questions was found to be 0.875 for 3 questions and 1.0 for the remaining questions, whereas the S-CVI was 0.9875. The I-CVI for the clarity of 30 questions was found 0.500 for 1 question, 0.875 for 3 questions, and 1.0 for the remaining questions. The S-CVI value for clarity was 0.97083. The Cronbach alpha coefficient for the total score of the Turkish EOSQ-SELF was recorded at 0.942. Common domains were significantly correlated with the Scoliosis Research Society questionnaire-22 revised.

Conclusions: We found excellent internal consistency in our study and were able to demonstrate the reliability as well as the validity of EOSQ-SELF in Turkish.

Level of evidence: Level I-diagnostic.