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Rasch analysis of the Geriatric Oral Health Assessment Index
Author(s) -
Franchigi Marco,
Giordano Andrea,
Levrini Luca,
Ferriero Giorgio,
Franchigi Franco
Publication year - 2010
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/j.1600-0722.2010.00735.x
Subject(s) - rasch model , rating scale , polytomous rasch model , oral health , scale (ratio) , medicine , index (typography) , psychometrics , psychology , gerontology , item response theory , clinical psychology , family medicine , developmental psychology , computer science , physics , quantum mechanics , world wide web
Franchignoni M, Giordano A, Levrini L, Ferriero G, Franchignoni F. Rasch analysis of the Geriatric Oral Health Assessment Index (GOHAI). Eur J Oral Sci 2010; 118: 278–283. © 2010 The Authors. Journal compilation © 2010 Eur J Oral Sci The aim of this study was to perform a psychometric analysis on the Geriatric Oral Health Assessment Index (GOHAI) using Rasch analysis, a modern statistical approach for examining rating scale data. Eighty‐five subjects, long‐term residents of a nursing home, were analysed using the GOHAI. The mean GOHAI score (range 0–48) was 11. Two of the five rating categories (1 = seldom; 3 = 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/always), the new model met the set criteria. Item 12 ‘sensitivity to hot, cold or sweets’ was misfitting. Rasch analysis showed both the unidimensionality of (at least) 11 of the 12 items of GOHAI, and the possibility of simplifying the structure of its rating scale.