Comparison of the self-administered and interviewer-administered modes of the child-OIDP

Georgios Tsakos, Eduardo Bernabé, Kevin O'Brien, Aubrey Sheiham, Cesar de Oliveira

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    Background: The mode of questionnaire administration may affect the estimates and applicability of oral health-related quality of life indicators. The aim of this study was to compare psychometrically the self-administered Child-OIDP index with the original interviewer-administered instrument. Methods: This was a cross-sectional study of 144 consecutive children aged 9-16 years referred to orthodontic clinics in Bedfordshire. To compare the two administration modes of the Child-OIDP, the sample was randomly split in two groups. The two groups were analysed in terms of baseline characteristics, self-perceived measures (self-rated oral health, self-perceived need for braces, happiness with dental appearance, frequency of thinking about dental appearance), Child-OIDP performance scores and overall score and psychometric properties (criterion validity and internal reliability). Results: No significant difference between the two groups was found in relation to their sociodemographic profile and self-perceived measures. The self- and interviewer-administered Child-OIDP had identical mean scores and did not differ in recording any of the eight performances (p ≥ 0.206). For criterion validity, the correlation coefficients of the Child-OIDP with self-perceived measures were not different between the two modes of administration (p ≥ 0.118). Furthermore, the Cronbach's alpha values of the two groups were similar (p = 0.466). Conclusion: This study demonstrated that the self-administered Child-OIDP performed the same as the original interviewer-administered mode, while at the same time reducing administration burden. This provides support for the use of the self-administered Child-OIDP. Further studies should focus on a more comprehensive psychometric evaluation. © 2008 Tsakos et al; licensee BioMed Central Ltd.
    Original languageEnglish
    Article number40
    JournalHealth and Quality of Life Outcomes
    Publication statusPublished - 2 Jun 2008


    • Adolescent
    • Child
    • Cross-Sectional Studies
    • psychology: Dental Care for Children
    • Female
    • Health Status Indicators
    • Humans
    • methods: Interviews as Topic
    • London
    • Male
    • Oral Health
    • Orthodontics
    • Patient Satisfaction
    • Pilot Projects
    • methods: Psychometrics
    • Quality of Life
    • Questionnaires
    • Reproducibility of Results
    • Socioeconomic Factors


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