Reliability and validity of a Japanese version of the Oral Health Impact Profile for edentulous subjects

Abstract

Objective: To evaluate the reliability and validity of the Japanese version of the Oral Health Impact Profile for edentulous (OHIP-EDENT-J) patients.

Background: Oral Health Impact Profile for edentulous is an appropriate instrument for assessing the Quality of life (QOL) in edentulous patients. However, the reliability and validity of the Japanese version had not been evaluated.

Methods: The study was conducted on 116 edentulous patients (Group A, requiring new dentures, n = 61; Group B, already having dentures, n = 55). Cronbach's alpha (α) was used to measure internal consistency of the summary scores for OHIP-EDENT-J and various subscales in Groups A and B. The interclass correlation coefficient (ICC) and 95% confidence interval of the summary scores for OHIP-EDENT-J and subscales were calculated. The summary scores for OHIP-EDENT-J in Groups A and B were compared with evaluate content validity. The Spearman's correlation coefficient between the summary scores for OHIP-EDENT-J and the satisfaction with dentures (100 mm VAS) was calculated for Groups A and B to evaluate concurrent validity.

Results: The reliability of the summary scores for OHIP-EDENT-J was good (α = 0.93). The ICC of the summary scores for OHIP-EDENT-J was 0.85. Summary scores for OHIP-EDENT-J were significantly different (p = 0.027) between Group A and Group B, with Group A having the higher value. The Spearman's correlation coefficient for the degree of satisfaction with dentures and the summary scores for OHIP-EDENT-J, calculated for Groups A and B (n = 107), was -0.609.

Conclusion: The OHIP-EDENT-J, a questionnaire on oral health-related QOL comprising 19 items, showed good reliability and validity for edentulous patients.