A Swedish version of the OIDP index

Objectives: The aim was to assess the validity and reliability of a Swedish version of the Oral Impacts on Daily Performance (OIDP) index measuring oral health related quality of life. Material and methods: After translation and cultural adaptation, a three-site sample of 205 adults (20-86 years) was interviewed using the OIDP. Moreover, the study included a self-administrated questionnaire and a clinical examination. Results: A total of 39.5% reported at least one oral impact on daily life. The most common performances affected were eating and cleaning teeth (both 20.6%). Oral affects on psychological performances caused the highest impacts. No gender and age differences in having at least one impact were demonstrated. However among those affected, women, old and young subjects scored higher than men and other ages, respectively, on the OIDP. The face and content validity were deemed as good in pilot interviews with laypersons and dental professionals. The construct validity was confirmed, as the OIDP score was consistently associated with self-perceived oral health, odds ratio (OR) 2.13 (95% confidence interval CI 1.10-4.10) and other self-rated variables, satisfaction with oral health OR 2.43 (95% CI 1.34-4.41), also when accounting for age, gender and differences in socio-economy. Associations were estimated using c2-test, Mann-Whitney's U-test and multivariate logistic regression. Missing 10 or more teeth was associated to having oral impacts, which supports the criterion validity of the instrument. A test-retest analysis showed a Cohen's kappa of 0.77. Conclusions: This Swedish version of the OIDP appears to be a valid and reliable measure for assessing the oral impacts on daily performances.

Acknowledgments: The study was supported by The Swedish Dental Society, Göteborg Dental Society and the Council for Medical Care Research in South Sweden, all gratefully acknowledged. The authors have nothing to disclose.