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Dimensions of Oral-health-related Quality of Life

¹ Department of Prosthodontics and Materials Science, School of Dentistry, University of Leipzig, Nürnberger Str. 57, 04103 Leipzig, Germany;
² Department of Dental Public Health Sciences, School of Dentistry, University of Washington, Seattle, WA 98195-7475, USA;
³ Center for Health Studies, Group Health Cooperative, 1730 Minor Avenue, Suite 1600, Seattle, WA 98101-1448, USA, and Department of Biostatistics, University of Washington, Seattle, WA 98195-7232, USA;
⁴ Department of Oral Medicine, School of Dentistry, University of Washington, Seattle, WA 98195-6370, USA;
⁵ Department of Epidemiology and Department of Health Services, School of Public Health and Community Medicine, University of Washington, Seattle, WA 98195-7236, USA; and
⁶ Institute of German Dentists, Universitätsstr. 73, 50931 Köln, Germany;

^* corresponding author, mike.john{at}medizin.uni-leipzig.de

Oral-health-related quality of life (OHRQoL) is expected to have multiple dimensions. It was the aim of this study to investigate the dimensional structure of OHRQoL measured by the Oral Health Impact Profile (German version) (OHIP-G) and to derive a summary score for the instrument. Subjects (N = 2050; age, 16–79 yrs) came from a national survey. We used rotated principal-components analysis to derive a summary score and to explore the dimensional structure of OHIP-G. The first principal component explained 50% of the variance in the data. The sum of OHIP-G item responses was highly associated with the first principal component (r = 0.99). This simple but informative OHIP-G summary score may indicate that simple sums are also potentially useful scores for other OHRQoL instruments. Four dimensions (psychosocial impact, orofacial pain, oral functions, appearance) were found. These OHIP-G dimensions may serve as a parsimonious set of OHRQoL dimensions in general.

KEY WORDS: oral-health-related quality of life • dimensions • factor analysis • questionnaire • population-based study

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