• Grzegorz Miekisiak, Mariusz Banach, Grzegorz Kiwic, Lukasz Kubaszewski, Jacek Kaczmarczyk, Adam Sulewski, Wojciech Kloc, Witold Libionka, Dariusz Latka, Marta Kollataj, and Rafal Zaluski.
• Department of Neurosurgery, Specialist Medical Center, Polanica-Zdroj, Poland, gmiekisiak@gmail.com.
• Eur Spine J. 2014 Apr 1; 23 (4): 898-903.

PurposePatient reported outcome measures play an increasingly important role in the outcomes research. The Core Outcome Measures Index (COMI) is a short, multidimensional instrument initially developed for the use by patients with low back pain. This study is an evaluation of a Polish version of COMI adapted for neck pain.MethodsOne hundred twenty-three patients complaining of neck pain were enrolled. All of them completed a questionnaire booklet containing COMI-neck, Neck Disability Index and Likert-type questions regarding the frequency of use of pain medications and pain frequency. Ninety-eight patients returned the retest questionnaire. Data quality was also assessed. Assessment of psychometric properties included examination of data quality, construct validity, test-retest reliability and factor analysis.ResultsThe quality of data was good with no missing answers and a little floor effect. Exploratory factor analysis revealed a single-factor structure. Reliability expressed as intraclass correlation coefficient was 0.88 (95% CI 0.84-0.92) for the overall COMI score and was generally good for most of individual core items. The minimum detectable change (MDC95%) was 1.97.ConclusionThis version of the COMI-neck is a valid and reliable instrument, with good psychometric properties. It can be recommended for Polish-speaking patients.

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