Oral diseases | 2021
Rasch validation of the Oral Health Impact Profile for Temporomandibular Disorders.
Abstract
OBJECTIVES\nThis study examined the metric properties of the Oral Health Impact Profile for Temporomandibular Disorders (OHIP-TMD) using Factor/Rasch analyses and created a short-form version of the measure.\n\n\nSUBJECTS AND METHODS\nAggregated OHIP-TMD data were obtained from a cross-sectional study involving 844 TMD patients with Diagnostic Criteria for TMDs defined conditions. The dimensionality of the OHIP-TMD was first evaluated with Exploratory Factor Analysis. An eigenvalue >1.0 and oblique oblimin rotation were applied for extracting the factors. Rasch analysis was subsequently performed on the primary dimension using the ConQuest software.\n\n\nRESULTS\nMulti-dimensionality of the OHIP-TMD was observed with the primary dimension comprising ten items. Adequate fit to the Rasch model was noted after deleting item 8 with infit/outfit mean square values ranging from 0.75 to 1.40 logits. Item difficulty ranged from -0.75 to 1.05 logits, while participants ability to respond varied from -4.55 to 5.19 logits. The respondent spread was slightly skewed and satisfactory item-response targeting was present.\n\n\nCONCLUSIONS\nThe 22-item OHIP-TMD demonstrated multi-dimensionality with the primary dimension consisting of nine reliable items with adequate fit to the Rasch model. The 9-item short-form version of the OHIP-TMD (SOHIP-TMD) is a promising tool for evaluating OHRQoL.