Submitted: 04 Apr 2016
Revision: 09 May 2016
Accepted: 10 May 2016
ePublished: 10 Aug 2016
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Health Promot Perspect. 2016;6(3): 145-151.
doi: 10.15171/hpp.2016.23
PMID: 27579258
PMCID: PMC5002881
  Abstract View: 915
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Original Article

Rasch analysis of the Persian version of PedsQLTM Oral Health Scale: further psychometric evaluation on item validity including differential item functioning

Chung-Ying Lin 1, Santhosh Kumar 2, Amir H. Pakpour 3 *

1 The Hong Kong Polytechnic University, Hung Hom, Hong Kong
2 Griffith University, Gold Coast, Australia
3 Social Determinants of Health Research Center, Qazvin University of Medical Sciences, Shahid Bahounar BLV, Qazvin, Iran


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.

Keywords: Children, Construct validity, Differential item functioning, Oral health, Quality of life, Rasch
Citation: Lin CY, Kumar S, Pakpour AH. Rasch analysis of the Persian version of PedsQLTM Oral Health Scale: further psychometric evaluationon item validity including differential item functioning. Health Promot Perspect. 2016;6(3):145-151. doi: 10.15171/hpp.2016.23.
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