Relationship between dental status and Oral Impacts on Daily Performances in older Southern Chinese people

Objective: The objective of this study was to assess the relationship between different clinical indicators of dental status and an Oral Health-Related Quality of Life (OHRQoL) measure, the Oral Impacts on Daily Performances (OIDP) index, using different scoring formats, among older Southern Chinese people. Methods: A total of 1,196 dentate people aged 55 years and older, attending routine annual health checkups at Guangxi Medical University Hospital Health Centre in Guangxi, China, participated in the study. They had a face-to-face structured interview and a clinical dental examination. The OIDP index was used to assess the impacts of oral conditions on quality of life. Spearman and Pearson as well as partial correlation coefficients were used to assess, respectively, the unadjusted and adjusted associations of 14 clinical indicators with the overall OIDP score, OIDP intensity, and OIDP extent. Results: All clinical indicators, except number of filled teeth, were significantly correlated with the OIDP index, after controlling for covariates. However, correlations were weak, ranging between 0.07 and 0.26. The strongest correlation was for the relationship between the number of natural plus replaced teeth and the OIDP index, irrespective of whether the overall OIDP score, OIDP intensity, or OIDP extent was used to measure OHRQoL. Conclusions: Clinical dental status indicators were related to OIDP, regardless of the scoring format used to calculate the OIDP index. Clinical indicators that included natural plus replaced teeth were more strongly associated with the OIDP index than their corresponding indicators that included only natural teeth.