• Xianzhao Wei, Honglei Yi, Bing Wu, Min Qi, Xiangsheng Liu, Zhi Chen, Guoyou Zhang, Wei Zhang, Ziqiang Chen, Zongde Yang, Jiayu Chen, Changwei Yang, Yushu Bai, Jingfeng Li, Xiaodong Zhu, and Ming Li.
• Department of Orthopaedics, Changhai Hospital, Second Military Medical University, No. 168, Changhai Road, Shanghai, 200433, People's Republic of China.
• J Clin Epidemiol. 2012 Dec 1;65(12):1321-8.

ObjectiveTo evaluate the reliability and validity of the simplified Chinese version of the Quebec Back Pain Disability Scale (SC-QDS).Study Design And SettingThe 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.ResultsSC-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).ConclusionsThe 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.Copyright © 2012 Elsevier Inc. All rights reserved.

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