Study to determine the internal consistency and validity of adapted German version
of Scoliosis Research Society-22 (SRS-22) questionnaire.
To evaluate the validity and reliability of adapted German version
of SRS-22 questionnaire
Summary of Background Data.
The SRS-22 questionnaire
was developed to assess the health-related quality of life for English-speaking patients with idiopathic scoliosis
. For scientific purpose and standardized comparison of outcome studies for the treatment of idiopathic scoliosis
its adaptation into German is necessary to respect cultural and lingual differences.
Translation/retranslation of the English version of the SRS-22 was conducted, and all steps for cross-cultural adaptation process were performed. Thus, SRS-22 questionnaire
and previously validated Roland-Morris score were mailed to 222 patients who had been treated surgically or conservatively for idiopathic scoliosis
. Seventy-eight patients (35%) responded to the first set of questionnaires and 54 of the first time responder returned their second survey. The median age of all patients who joined the study was 19 years. Measures of reliability namely, selectivity, internal consistency, and reproducibility were determined by Cronbach’s α statistics and intraclass correlation coefficient, respectively. Concurrent validity was measured by comparing with an already validated questionnaire (Roland-Morris score). Measurement was made using the Spearman correlation coefficient.
The study demonstrated satisfactory internal consistency with high Cronbach’s α values for 4 of the corresponding domains (pain, 0.75; self-image, 0.84; mental health, 0.88; and satisfaction, 0.61). However, the Cronbach’s α value for function/activity domain (0.67) was considerably lower than the original English questionnaire. For the same domains intraclass correlation coefficient demonstrating satisfactory test/retest reproducibility.
The adapted German version
of the SRS-22 questionnaire
can be used to assess the outcome of treatment for German-speaking patients with idiopathic scoliosis