Introduction: The SRS-24 outcomes measure was designed to allow monitoring of scoliosis patients health-related quality of life. Introduced in 1999 it fulfilled a need and was widely used. A number of improvements in the questionnaire's psychometric properties produced a sequence of three improved editions. This resulted in the need to establish, if possible, conversion equations to the last edition, SRS-22r. Our purpose is to assess the feasibility of translating similar domain scores from SRS-24, SRS-23 and SRS-22 to SRS-22r.
Materials and Methods: A consolidated questionnaire of 49 questions was developed that incorporated the different questions on the four questionnaires. This consolidated questionnaire was administered by mail to 121(100 F, 21 M) patients, age 23.3±4.52, who had been previously operated for adolescent idiopathic scoliosis at age 14.7±2.33 years. Regression modeling, taking into account the non-normality of data distribution, was used to establish conversion equations from the SRS-24, SRS-23 and SRS-22 to SRS-22r.
Results: SRS-22r pain, function, self-image and satisfaction/dissatisfaction with management domain scores can be reasonably estimated from related SRS-24 domain scores: R2 scores of 0.61 to 0.75 (Table 1). SRS-24 domains requiring recall correlated poorly. SRS 23 and SRS 22 score correlation with similar SRS-22r domain scores was excellent.
Conclusion: These results suggest that SRS-24 domain scores not utilizing recall can be satisfactorily converted to similar SRS-22r domain scores, thus permitting longitudinal health-related quality of life follow-up. SRS-23 and SRS-22 scores can be translated to SRS-22r scores with a high degree of accuracy.