Assessing the level of agreement between the self- and interview-administered Child-OIDP

To assess the level of agreement between the self- and interviewer-administered Child version of the Oral Impacts on Daily Performances (Child-OIDP) index.

This was a randomised study in 177 children aged 10-13 years from Granada (Spain). All children completed both administration modes of the Child-OIDP; half the sample received the interviewer-administered version first (n = 90), and the other half the self-administered version first (n = 87). This was done to address potential order effects due to the sequential administration of both instruments. The level of agreement between both modes of administration was assessed with the Bland and Altman method for the Child-OIDP score and Kappa for the prevalence of oral impacts.

The two groups did not differ in their socio-demographic characteristics or self-perceived oral health measures. No order effects were found. There was no significant difference between the two modes of administration in terms of the overall score and prevalence of oral impacts (P > or = 0.784 in both cases). The mean difference in Child-OIDP scores was 0.03 (95% CI = -0.29 to 0.35) and the 95% limits of agreement were -6.32 and 4.93. Kappa value for the prevalence of impacts was 0.92.

The self- and interviewer-administered Child-OIDP had a high level of agreement, irrespectively of whether the overall score or the prevalence of oral impacts was used to describe children's quality of life.