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J Clin Epidemiol. 2012 Dec;65(12):1321-8. doi: 10.1016/j.jclinepi.2012.06.007. Epub 2012 Aug 15.

A valid cross-culturally adapted simplified Chinese version of the Quebec Back Pain Disability Scale.

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1
Department of Orthopaedics, Changhai Hospital, Second Military Medical University, No. 168, Changhai Road, Shanghai, 200433, People's Republic of China.

Abstract

OBJECTIVE:

To evaluate the reliability and validity of the simplified Chinese version of the Quebec Back Pain Disability Scale (SC-QDS).

STUDY DESIGN AND SETTING:

The QDS was translated and cross-culturally adapted into SC following international guidelines. The SC-QDS was completed by 114 patients with low back pain (LBP) and 65 healthy controls, along with the SC Oswestry Disability Index (SC-ODI) and visual analogue scale (VAS). Psychometric evaluation included homogeneity and reproducibility by internal consistency and test-retest reliability and construct validity by calculating the Pearson's correlation coefficients among QDS, SC-ODI, and VAS. Discriminative validity was determined by student's t-test.

RESULTS:

SC-QDS scores were well distributed, with no floor or ceiling effects. Internal consistency was excellent (Cronbach α 0.976). The items and overall SC-QDS were correlated (r=0.640-0.898 and P<0.0001). Intraclass correlation coefficient of test-retest reliability was excellent (0.987, 95% confidence interval: 0.978-0.992). Construct validity was confirmed by high correlation of SC-QDS and SC-ODI (r=0.901 and P<0.0001) and VAS (r=0.770 and P<0.0001) scores, as was discriminative validity by significantly different SC-QDS scores for patients with LBP and controls (46.3 ± 19.9 vs. 14.6 ± 8.5 and P<0.0001).

CONCLUSIONS:

The SC-QDS has good internal consistency, test-retest reliability, and construct and discriminative validity. The SC-QDS is appropriate for clinical and research uses with Chinese-speaking patients with LBP in mainland China.

PMID:
22901397
DOI:
10.1016/j.jclinepi.2012.06.007
[Indexed for MEDLINE]

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