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Reliability and validity of the Polish version of the Core Outcome Measures Index for the neck
Authors:Grzegorz Miekisiak  Mariusz Banach  Grzegorz Kiwic  Lukasz Kubaszewski  Jacek Kaczmarczyk  Adam Sulewski  Wojciech Kloc  Witold Libionka  Dariusz Latka  Marta Kollataj  Rafal Zaluski
Institution:1. Department of Neurosurgery, Specialist Medical Center, Polanica-Zdroj, Poland
2. Department of Neurosurgery, St. Raphael’s Hospital, Kraków, Poland
3. Department of Neurosurgery, Regional Specialist Hospital, Jastrzebie-Zdroj, Poland
4. Department of Orthopedics, University of Medical Sciences, Poznan, Poland
5. Department of Neurology and Neurosurgery, Faculty of Medical Sciences, University of Varmia and Masuria, Olsztyn, Poland
6. Department of Neurosurgery, Pomeranian Traumatology Center, Gdańsk, Poland
7. Department of Neurosurgery, Regional Medical Center, Opole, Poland
8. Department of Pain Research and Treatment of Jagiellonian University, Kraków, Poland
9. Department of Neurosurgery, Medical University of Wroclaw, Wroc?aw, Poland
Abstract:

Purpose

Patient 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.

Methods

One 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.

Results

The 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.

Conclusion

This version of the COMI-neck is a valid and reliable instrument, with good psychometric properties. It can be recommended for Polish-speaking patients.
Keywords:Patient reported outcomes  COMI  Spine Tango  Validation  Neck pain
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