Hazard ratios for 5-year overall mortality in oral cancer patients with and without mental illness (<i>n</i> = 16687).

95% CI, 95% confidence interval. *Adjusted for patient age, gender, Charlson Comorbidity Index Score, geographic region, urbanization level, enrollee category, hospital ownership, and accreditation level. **Adjusted for patient age, gender, Charlson Comorbidity Index Score, geographic region, urbanization level, enrollee category, hospital ownership, accreditation level, and treatment modality.