Factor analyses of the Oral Health Impact Profile - overview and studied population.
OBJECTIVE
A desideratum of oral health-related quality of life (OHRQoL) instruments - such as the Oral Health Impact Profile (OHIP) - is that they accurately reflect the structure of the measured construct(s). With this goal in mind, the Dimensions of Oral Health-Related Quality of Life (DOQ) Project was proposed to investigate the number and nature of OHRQoL dimensions measured by OHIP. In this report, we describe our aggregate data set for the factor analyses in the project, which consists of responses to the 49-item OHIP from general population subjects and prosthodontics patients from 6 countries, including a large age range of adult subjects and both genders.


METHODS
The DOQ Project's aggregate data set combines data from 35 individual studies conducted in Croatia, Germany, Hungary, Japan, Slovenia, and Sweden.


RESULTS
The combined data set includes 10778 OHIPs from 9348 individuals (N=6349 general population subjects, N=2999 prosthodontic patients). To elucidate the OHIP latent structure, the aggregated data were split into a Learning Sample (N=5173) for exploratory analyses and a Validation Sample (N=5022) for confirmatory analyses. Additional data (N=583) were assigned to a third data set.


CONCLUSIONS
The Dimensions of Oral Health-Related Quality of Life Project contains a large amount of international data and is representative of populations where OHIP is intended to be used. It is well-suited to assess the dimensionality of the questionnaire.
Department of Diagnostic and Biological Sciences, University of Minnesota, Minneapolis, USA. Electronic address: mtjohn@umn.edu.
Mike T
MT
John
Department of Prosthetic Dentistry, Center for Dental and Oral Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
Daniel R
DR
Reißmann
Department of Psychology, University of Minnesota, Minneapolis, USA.
Leah
L
Feuerstahler
Department of Psychology, University of Minnesota, Minneapolis, USA.
Niels
N
Waller
Department of Prosthodontics, Showa University, Tokyo, Japan.
Kazuyoshi
K
Baba
Centre of Oral Rehabilitation, Prosthetic Dentistry, Norrköping, Sweden.
Pernilla
P
Larsson
Department of Prosthodontics, University of Zagreb, Zagreb, Croatia.
Asja
A
Čelebić
Department of Prosthodontics, University of Pécs, Pécs, Hungary.
Gyula
G
Szabo
Department of Prosthodontics, University of Ljubljana, Ljubljana, Slovenia.
Ksenija
K
Rener-Sitar
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009909:Oral Health; D011476:Prosthodontics; D011788:Quality of Life; D011795:Surveys and Questionnaires; D055815:Young Adult
Factor analysis; General population; Oral Health Impact Profile; Prosthodontic patients; Questionnaire