Transcultural adaptation of the neck disability index to mexican spanish and assessment of its psychometric properties.

Purpose: To transculturally adapt the Neck Disability Index to Mexican Spanish (NDI-Mx) and to evaluate its psychometric properties.

Methods: Translation and transcultural adaptation of the NDI were conducted according to published guidelines. The test-retest reliability of the NDI-Mx was assessed with intraclass correlation coefficient (ICC), the student t-test, standard error of measurement, minimal detectable change and Bland-Altman plot.