Skip Navigation LinksHome > February 15, 2005 - Volume 30 - Issue 4 > The Validity of the SRS-22 Instrument in an Adult Spinal Def...
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doi: 10.1097/01.brs.0000153393.82368.6b
Health Services Research

The Validity of the SRS-22 Instrument in an Adult Spinal Deformity Population Compared With the Oswestry and SF-12: A Study of Response Distribution, Concurrent Validity, Internal Consistency, and Reliability

Bridwell, Keith H. MD; Cats-Baril, William PhD; Harrast, John; Berven, Sigurd MD; Glassman, Steven MD; Farcy, Jean-Pierre MD; Horton, William C. MD; Lenke, Lawrence G. MD; Baldus, Christine RN; Radake, Terri RN

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Abstract

Study Design. Prospective analysis of a consecutive cohort of adult spinal deformity patients queried over a 12-month period.

Objectives. To assess the SRS-22 instrument compared with the SF-12 and Oswestry.

Summary of Background Data. Very few reports in the literature have applied the SRS-22 to adult spinal deformity patients.

Methods. Consecutive adult spinal deformity patients were applied the SRS-22, SF-12, and Oswestry. Four analyses were done: 1) floor/ceiling effect; 2) Pearson’s correlation coefficients between the SRS-22, SF-12, and Oswestry; 3) Cronbach’s alpha analysis for internal consistency within the SRS-22; and 4) test/retest.

Results. Floor/ceiling range for the SRS-22 compared favorably with the SF-12 and Oswestry. The Pearson’s coefficients correlating the two questionnaires relative to the SRS-22 were > 0.7. The Cronbach’s alpha within each domain for the SRS-22 were > 0.7, except for pain (0.67). Test/retest correlation coefficients ranged from 0.84 to 0.95 for the subscales.

Conclusions. The SRS-22 is a disease-specific instrument with the capacity to demonstrate change in health status more effectively than the SF-12 and in more domains than the Oswestry. The SRS-22 showed high criterion validity with the SF-12 and Oswestry based on Pearson’s coefficients. High Cronbach’s alpha scores suggested a high internal consistency within each domain of the SRS-22, except for pain (0.67). Test/retest reliability was excellent.

© 2005 Lippincott Williams & Wilkins, Inc.

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