Translation and Validation of the Niigata PPPD Questionnaire into Tamil: A Tool to Assess Persistent Postural-Perceptual Dizziness.

PPPD is a chronic and functional disorder without diagnostic data and definitive laboratory tests. In such conditions, questionnaires are the easiest quantifiable measures to identify and rate the severity of individuals suffering from PPPD. The current study aimed to adapt the Niigata PPPD Questionnaire (NPQ) into Tamil language and analyze its psychometric properties. A conventional method of translation involving forward and backward translation was carried out, followed by subsequent content validation. The translated version was field tested in three groups, the controls, the dizzy group, and PPPD group, for further analysis. The final Tamil version of the questionnaire, NPQ-T, had good reliability and validity. This version was identified to have good sensitivity and specificity in discriminating the PPPD group from the dizzy group. The NPQ in Tamil (NPQ-T) is a valid tool for identifying individuals with PPPD and noting the severity of the exacerbating factors.