title: [Psychometric properties of the Italian version of the reduced form of the Oral Health Impact Profile (OHIP-14)].
abstract: Aim of this study was to perform a comprehensive psychometric analysis of the Italian version of the Oral Health Impact Profile short-form (OHIP-14)--a questionnaire analysing the oral health-related quality of life--using both classical test theory and Rasch analysis. Eighty-five subjects, residents in a long-term nursing home, were analysed using the OHIP-14, Geriatric Oral Health Assessment Instrument (GOHAI) and a global clinical judgement. Two of the five rating categories (1 = almost never; 3 = quite often) did not comply with the Rasch criteria for category functioning. After collapsing rating categories into a three-level rating scale (0 = never; 1 = sometimes; 2 = often), the new model met the set criteria. Item 12 ('difficulty doing usual jobs') was slightly underfitting. At the principal component analysis on the standardized residuals, item 9 ('difficulty to relax') and 11 ('irritable with other people') showed a high correlation (r = 0.66). This indicates that they may not be locally independent. Rasch analysis showed both the substantial unidimensionality of OHIP-14, and the possibility of simplifying the structure of its rating scale. Further studies are needed to confirm the stability of these findings in different testing situations.
authors.affiliation: S.C.D.U. Odontoiatria e Stomatologia, Azienda Ospedaliera Universitaria Maggiore della Carità, Novara, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Franchignoni
authors.forename: Andrea
authors.initials: A
authors.lastname: Giordano
authors.forename: Elisa
authors.initials: E
authors.lastname: Brigatti
authors.forename: Mario
authors.initials: M
authors.lastname: Migliario
authors.forename: Luca
authors.initials: L
authors.lastname: Levrini
authors.forename: Giorgio
authors.initials: G
authors.lastname: Ferriero
mesh_terms: D006801:Humans; D007558:Italy; D007802:Language; D009909:Oral Health; D011594:Psychometrics; D011795:Surveys and Questionnaires