Structural Validity and Factorial Analysis of the Brazilian Oral Health Impact Profile for Temporomandibular...

To evaluate the structural validity of the Brazilian version of the Oral Health Impact Profile for Temporomandibular Disorders (OHIP-TMD-Br) and to compare its performance with the widely used OHIP-14 instrument.

Sample of 72 patients completed both questionnaires. Exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) were conducted. Sample adequacy was assessed using the Kaiser-Meyer-Olkin (KMO) measure and Bartlett's test of sphericity. CFA was performed using Root Mean Square Error of Approximation (RMSEA), Tucker-Lewis Index (TLI), Comparative Fit Index (CFI), and Standardized Root Mean Square Residual (SRMR).

EFA demonstrated excellent sample adequacy for both instruments: KMO = 0.877 (OHIP-14) and 0.925 (OHIP-TMD-Br). Bartlett's test of sphericity was statistically significant (χ²(231) = 2378, p < 0.001), demonstrating inter-variable correlation. CFA validated the seven-domain structure of the OHIP-TMD-Br, with acceptable to excellent fit indices (RMSEA = 0.055; TLI = 1.012; CFI = 1.000; SRMR = 0.061). Convergent validity was confirmed by a strong Spearman correlation between the total scores of both instruments (r = 0.840). Customized Poisson regression demonstrated a positive association between the instruments.

OHIP-TMD-Br proved to be a reliable and valid tool for assessing the impact of temporomandibular disorders on oral health-related quality of life in Brazil.