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Cross-cultural adaptation and validation of the Traditional Chinese version of the Core Outcome Measures Index in patients with low back pain |
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| Authors: | Wu Po-Chien Hsu Jui-Chen Mannion Anne F. Wu Christopher Lee Ching-Yu Huang Tsung-Jen Lin Yen-Kuang Wu Meng-Huang |
| Affiliation: | 1.Department of Dermatology, Chang Gung Memorial Hospital, Linkou, Taoyuan, Taiwan, ROC ;2.College of Medicine, Taipei Medical University, Taipei, 110, Taiwan, ROC ;3.Department of Medical Education, Taipei Medical University, Taipei, 110, Taiwan, ROC ;4.Spine Center Division, Department of Research and Development, Schulthess Klinik, Lengghalde 2, 8008, Zurich, Switzerland ;5.Department of Orthopedics, Taipei Medical University Hospital, No. 252, Wuxing St., Xinyi Dist., Taipei, 11031, Taiwan, ROC ;6.Department of Orthopaedics, School of Medicine, College of Medicine, Taipei Medical University, Taipei, 110, Taiwan, ROC ;7.Graduate Institute of Athletics and Coaching Science, National Taiwan Sport University, No. 250, Wenhua 1st Rd., Guishan Dist., Taoyuan City, 333325, Taiwan, ROC ;8.TMU Biodesign Center, Taipei Medical University, No. 250, Wuxing St., Xinyi Dist., Taipei, 11031, Taiwan, ROC ; |
| Abstract: | Purpose This study aimed to carry out a cross-cultural adaptation of the Core Outcome Measures Index (COMI) for use in Traditional Chinese-speaking patients with low back pain (LBP) and to investigate its psychometric properties. MethodsA total of 224 patients with LBP > 6 weeks who visited our spine center from May 2018 to May 2019 were included in the study. Patients completed a booklet of questionnaires including the following: (1) pain Numeric Rating Scale, (2) Oswestry Disability Index, (3) Roland–Morris Disability Questionnaire, (4) EuroQol-five dimension (EQ-5D), and (5) COMI. Patients were sent a second booklet (also containing a transition question to indicate any change in condition) to be completed again within one month after the first. Fifty-two patients did not receive any intervening treatment (group 1), while the other 172 patients received medical treatment (group 2) between the two questionnaires. ResultsThe intraclass correlation coefficient (ICC) for the COMI summary score was 0.94 (95% CI 0.89–0.97); the standard error of measurement (SEM) was 0.41 and the minimum detectable change (MDC) score was 1.14. The COMI summary scores showed a low floor effect (1.8%) and ceiling effect (0.4%). All COMI item scores demonstrated the hypothesized correlations with their corresponding full-length questionnaires except for the pain item (correlation stronger than hypothesized). Standardized response means (SRM) for the COMI items in the treated group were between 0.58 and 1.30. Regarding the ability of the COMI change score to differentiate between good and poor outcomes, the area under the receiver operating characteristic (AUROC) curve was 0.77 [standard error (SE) 0.07, 95% confidence interval (CI) 0.68–0.84] and the minimal clinically important change (MCIC) score was ≥ 1.85 points. ConclusionThe Traditional Chinese COMI represents a practical and reliable tool for the assessment of Traditional Chinese-speaking patients with back problems. |
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