Purpose
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.
Material and 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 10,778 OHIPs from 9,348 individuals
(N=6,349 general population subjects, N=2,999 prosthodontic patients). To
elucidate the OHIP latent structure, the aggregated data were split into a
Learning Sample (N=5,173) for exploratory analyses and a Validation Sample
(N=5,022) for confirmatory analyses. Additional data (N=583) were assigned
to a third data set.
Conclusion
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.