Abstract
Background: The study aimed to further evaluate the psychometric properties of one recently developed oral health related quality of life (OHRQoL) instrument (PedsQL Oral Health Scale), including student self-report and parent-proxy report. Specifically, we tested the item validity,threshold order, local dependency, and differential item functioning (DIF) across gender and rater. Methods: This is a cross-sectional study, and study population was recruited in Qazvin, Iran using one-stage sampling with the unit of school. Students and their parents (1529 dyads) separately completed the Persian version of PedsQL Oral Health Scale. The psychometric properties were analyzed using Rasch rating scale model, including item validity, threshold order for response categories, and DIF across gender (boys vs. girls in student self-report) and rater (student self report vs. parent-proxy report). Results: All items had satisfactory in fit and outfit mean square error. One disordering category (the response of often) was found in parent-proxy report, while all categories were ordered in student self-report. All items were DIF-trivial across gender and rater. Conclusion: PedsQL Oral Health Scale is a valid instrument to measure OHRQoL. However, our results indicated that the parent-proxy report was inferior to the student self-report, and healthcare providers should primarily use the student self-report.
Highlights
Over the last decades, the concept of quality of life (QoL) in relation to general and oral health has received increased attention,[1] and many instruments have been developed because of this growing importance.[2]
We aimed to evaluate the validity of Persian PedsQL Oral Health Scale using Rasch analysis
In addition to testing unidimensionality, we examined the separation reliability and indices, threshold order, local dependency, and differential item functioning (DIF) for the PedsQL Oral Health Scale
Summary
The concept of quality of life (QoL) in relation to general and oral health has received increased attention,[1] and many instruments have been developed because of this growing importance.[2]. The PedsQL Oral Health Scale has been designed as a 5-item questionnaire including child self-reports and parent-proxy reports. The study aimed to further evaluate the psychometric properties of one recently developed oral health related quality of life (OHRQoL) instrument (PedsQL Oral Health Scale), including student self-report and parent-proxy report. Methods: This is a cross-sectional study, and study population was recruited in Qazvin, Iran using one-stage sampling with the unit of school Students and their parents (1529 dyads) separately completed the Persian version of PedsQL Oral Health Scale. The psychometric properties were analyzed using Rasch rating scale model, including item validity, threshold order for response categories, and DIF across gender (boys vs girls in student self-report) and rater (student selfreport vs parent-proxy report). Our results indicated that the parent-proxy report was inferior to the student self-report, and healthcare providers should primarily use the student self-report
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