Figure. Relationship between overbite/overjet and self-report of three TMD symptoms. Best-fitted curves with 95% confidence intervals for the association between overbite or overjet and three symptoms of self-reported TMD by means of fractional polynomial regression. The lines are the partial linear predictors for the variable in question. A flat curve indicates no association, and lower values indicate less risk. The residuals in the statistical model are presented as dots.

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