項目応答理論による全部床義歯装着者を対象としたそしゃく能力検査表の開発

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  • Construction of a Scale for Evaluating Masticatory Ability of Complete Denture Wearers using Item Response Theory.

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The purposes of this study were to verify unidimensionality of the questionnaire comprising 58 food items designed to evaluate the masticatory ability of complete denture wearers, and to reconstruct it to be shorter but accurate using the item response theory (IRT). The 230 subjects were edentulous and complete denture wearers.<BR>The results were as follows:<BR>1. Forty-one items showed unidimensionality based on principal factor analysis of the tetrachoric correlation matrix, except 17 items whose proportions of correct answers were above 0.90.<BR>2. A one-parameter logistic model was applied to 26 items, whose principal factor solutions were above 0.69, and fitted the model based on chi-square statistics. The parameters were standardized according to ability.<BR>3. The scale, which comprises 10 items and serves as an approximate interval scale, was reconstructed.<BR>4. The KR-20 coefficient of the scale was 0.83.<BR>5. The scores showed significant differences between the three groups which were classified by subjective assessments of their own masticatory abilities (p<0.01): male scores were higher than those of females (p<0.05), were unrelated to age (r=-0.15, p<0.05), and increased when new dentures were made (p<0.01).<BR>6. It appeared that the scale has high reliability and validity as a clinical test.

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