title: Confirmatory factor analysis of the Oral Health Impact Profile.
abstract: Previous exploratory analyses suggest that the Oral Health Impact Profile (OHIP) consists of four correlated dimensions and that individual differences in OHIP total scores reflect an underlying higher-order factor. The aim of this report is to corroborate these findings in the Dimensions of Oral Health-Related Quality of Life (DOQ) Project, an international study of general population subjects and prosthodontic patients. Using the project's Validation Sample (n = 5022), we conducted confirmatory factor analyses in a sample of 4993 subjects with sufficiently complete data. In particular, we compared the psychometric performance of three models: a unidimensional model, a four-factor model and a bifactor model that included one general factor and four group factors. Using model-fit criteria and factor interpretability as guides, the four-factor model was deemed best in terms of strong item loadings, model fit (RMSEA = 0·05, CFI = 0·99) and interpretability. These results corroborate our previous findings that four highly correlated factors - which we have named Oral Function, Oro-facial Pain, Oro-facial Appearance and Psychosocial Impact - can be reliably extracted from the OHIP item pool. However, the good fit of the unidimensional model and the high interfactor correlations in the four-factor solution suggest that OHRQoL can also be sufficiently described with one score.
authors.affiliation: Department of Diagnostic and Biological Sciences, University of Minnesota, Minneapolis, MN, USA.
authors.forename: M T
authors.initials: MT
authors.lastname: John
authors.forename: L
authors.initials: L
authors.lastname: Feuerstahler
authors.forename: N
authors.initials: N
authors.lastname: Waller
authors.forename: K
authors.initials: K
authors.lastname: Baba
authors.forename: P
authors.initials: P
authors.lastname: Larsson
authors.forename: A
authors.initials: A
authors.lastname: Celebić
authors.forename: D
authors.initials: D
authors.lastname: Kende
authors.forename: K
authors.initials: K
authors.lastname: Rener-Sitar
authors.forename: D R
authors.initials: DR
authors.lastname: Reissmann
mesh_terms: D005060:Europe; D005163:Factor Analysis, Statistical; D006801:Humans; D007564:Japan; D009909:Oral Health; D011788:Quality of Life; D018434:Sickness Impact Profile; D011795:Surveys and Questionnaires
keywords: Oral Health Impact Profile; confirmatory factor analysis; dimensions; factor structure; oral health-related quality of life