Validating an alternate version of the chewing function questionnaire in partially dentate patients
The aim of this study was to investigate the dimensionality, reliability, and validity of an alternate version of the chewing function questionnaire in partially dentate patients in Japan.
Methods: Subjects were partially dentate patients who attended the prosthodontic clinic at Tokyo Medical and Dental University (N = 491, 71% women, mean age ( SD): 63.0 +/- 11.5 years). The questionnaire asked each subject to rate his or her ability to chew 20 common Japanese foods.
For each individual, responses were combined to yield a chewing function summary score, with higher scores indicating better self-reported chewing ability. We used exploratory factor analysis to investigate the scores' dimensionality.
For validity assessment, we computed the correlations between the chewing function score and oral health-related quality of life (OHRQoL, as measured by the Japanese 14-item Oral Health Impact Profile (OHIP-14)). Internal consistency of scores and test-retest reliability were investigated by asking a subset of subjects (N = 62) to complete the questionnaire twice, 2 weeks apart.
Results: Exploratory factor analysis provided some evidence that self-reported chewing ability can be characterized by a summary score. Support for the validity of chewing function scores produced using the alternate version of the questionnaire was derived from correlations with OHIP-14 scores (r = -0.46, 95% confidence interval (CI): -0.53 to -0.39); thus, better chewing ability was associated with less impaired OHRQoL.
Internal consistency was 'satisfactory,' with a Cronbach's alpha of 0.90 (lower limit of 95% CI: 0.89). The test-retest reliability was 'fair to good,' with an intraclass correlation coefficient of 0.69 (95% CI: 0.56-0.82).
Conclusions: The alternate version of the chewing function questionnaire can be used as a stand-alone instrument, based on the reliability and validity of scores demonstrated using the questionnaire in partially dentate patients.
Author: Kazuyoshi Baba, Mike T John, Mika Inukai, Kumiko Aridome and Yoshimasa Igarashi
Credits/Source: BMC Oral Health 2009, 9:9
Published on: 2009-03-16
Copyright by the authors listed above - made available via BioMedCentral (Open Access). Please
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