Cross-cultural adaptation of the Revised Neurophysiology of Pain Questionnaire into the Turkish language based on Rasch analysis.

BACKGROUND

The Revised Neurophysiology of Pain Questionnaire (Revised-NPQ-Tr) is used to evaluate the change in pain knowledge. No study has explored its validity and reliability for the Turkish language.

OBJECTIVES

This study aims to determine the psychometric properties of the Turkish version of the Revised-NPQ-Tr in chronic spinal pain patients.

METHODS

A total of 182 chronic spinal pain patients were included in the study. The Revised-NPQ-Tr results were analyzed using Rasch analysis to measure the psychometric properties.

RESULTS

The Revised-NPQ-Tr indicates misfit to the Rasch model, as evidenced by the borderline significant value (LR test = 27.626; df = 11; = .004; Bonferroni-adjusted α = 0.004). Two items were differentially affected by educational status. Removal of poor-functioning items did not improve the psychometric properties of the questionnaire. The Revised-NPQ-Tr is unidimensional and there was no local dependence between items. The questionnaire exhibits known group validity. Test-retest reliability of the questionnaire was moderate [intraclass correlation coefficient (ICC) = 0.629]; however, the internal consistency of the questionnaire was found to be low (Cronbach's α = 0.330; person separation index = 0.373).

CONCLUSION

Although the internal validity of the Revised-NPQ-Tr version was acceptable, its reliability was found to be low. Consequently, the results of Revised-NPQ-Tr should be interpreted carefully in the clinic.