Background Neck pain is a musculoskeletal disorder causing high societal and economic costs. The comparison of different treatment strategies across several countries using validated outcome measure is vital in the field of neck pain research. As the Neck Bournemouth Questionnaire (NBQ) holds validated versions with acceptable psychometric properties in several languages, we studied the psychometric properties of the questionnaire in the italian population.
Objectives Cross-cultural adaptation and validation of the Italian NBQ (NBQ-I).
Methods The forward and back translations of the questionnaire produced the pre-final version, which was adopted as the italian version of the questionnaire (NBQ-I) after preliminary testing on the target population and final approval by an expert committee. The questionnaire was administered in two times, being respectively the beginning and the end of a physiotherapy treatment delivered to the patients with neck pain attending the rehabilitation unit of Santa Corona Hospital (Pietra Ligure, IT). The construct validity and responsiveness were computed by means of hypotheses testing regarding the absolute magnitude of correlations of, respectively, the test scores and change score of the NBQ-I using the Neck Pain and Disability Scale (NPDS), the Numerical Rating Scale for pain intensity (PAIN-NRS), the EuroQoL 5 Dimension Index (EQ5D-IND) and its Numerical Rating Scale for quality of life (EQ5D-NRS) as comparators. The mean change score between the two administrations, the Minimal Clinical Important Difference (MCID) and the floor and ceiling effects were the values used to describe the interpretability.
Results The NBQ had acceptable psychometric characteristics (Table 1). 96 subjects with chronic neck pain completed the questionnaire's administration. The results of the hypotheses testing process revealed a moderate-to-high construct validity and a poor responsiveness of the NBQ-I. The change score had mean 9.4 (SD =13.3) and MCID 5.5 points. Floor and ceiling effects were not observed.
Conclusions The NBQ-I was successfully validated in a sample of subjects with chronic neck pain. The good construct validity was further supported because the correlations of the test scores with the comparator instruments reflected those observed in different languages. Although the responsiveness was poor, the change score to detect a clinical improvement in the subjects was minimal and resembled those observed in similar populations.1 A limit of this study was the absence of the reliability analysis.
Gay RE, Madson TJ, Cieslak KR. Comparison of the neck disability index and the neck bournemouth questionnaire in a sample of patients with chronic uncomplicated neck pain. J Manipulative Physiol Ther 2007;30:259-262.
Disclosure of Interest None declared