Abstract
BackgroundThe 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.MethodsThis 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).ResultsNo 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).ConclusionThis 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.
Highlights
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 with the original interviewer-administered instrument. Sample design This was a cross-sectional study of 144 consecutive children aged 9–16 years referred to orthodontic clinics in the Bedfordshire Personal Dental Service (PDS) for orthodontic diagnosis and treatment
The same was the case for the comparison between the two groups in relation to the prevalence of the different performances and the overall Child-OIDP (p ≥ 0.165 in all cases)
Summary
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 intervieweradministered instrument. This study assesses differences between two different administration modes of an oral health-related quality of life (OHRQoL) measure for children. The Child-OIDP [1] is an interviewer-administered OHRQoL measure that assesses the frequency and severity of oral impacts on (page number not for citation purposes). The effect of the mode of questionnaire administration on the estimates of health-related indicators is important [5,6]. Interviewer-administered questionnaires are associated with higher response rates compared to self-administered instruments. The most important conceptual issue relates to the comparability between data collected with interviewer- and self-administered questionnaires [5,6,7]
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