Abstract
Aim: To validate a Vietnamese short version (OHIP- 14VN) for use in epidemiological studies. Methods: The original English-language version was translated into Vietnamese, back translated and after some revisions tested for psychometric properties. Subjects (n = 724) were asked to self-administer a questionnaire but could ask for assistance. Convergent validity was tested by investigating associations between OHIP domain and total scores, and dichotomized self-reported satisfaction with 1) the dentition in general, 2) chewing function, and 3) esthetics. Groups validity was evaluated by comparing OHIP scores of subjects having ≤6 molars vs. >6 molars and tooth decay vs. no decay. Test-retest reliability was investigated in a convenience sample (n = 54) and expressed in Intraclass Correlation Coefficients (ICCs). Internal consistency was assessed by Cronbach’s alpha and average interitem correlation coefficients. Results: Validity: all associations were in the hypothesized directions. Differences in mean OHIP total were statistically sig-nificant for all discriminative variables. OHIP scores completed with assistance were significantly lower than those from self-administered questionnaires and therefore analyzed separately. For both administration formats differences in mean scores were still significant for “satisfaction” but for having ≤6 molars or decay the differences lost significance for most domain and total scores. Reliability: ICCs ranged from 0.54 - 0.74. Internal consistency: Cronbach’s alphas for OHIP total scores were 0.93 (self-administered) and 0.91 (with assistance). Average interitem correlation coefficients ranged from 0.26 - 0.67 (self-administered) and 0.28 - 0.69 (with assistance). Conclusions: This Vietnamese version of the OHIP-14 demonstrated good construct validity and acceptable reliability for OHIP total scores however OHIP-14VN domain scores should be interpreted with caution.
Highlights
It has been recognized that objective indicators are important when evaluating oral diseases or treatment outcomes [1,2]
This Vietnamese version of the Oral Health Impact Profile (OHIP)-14 demonstrated good construct validity and acceptable reliability for OHIP total scores OHIP-14VN domain scores should be interpreted with caution
To decrease the time needed for completion of the instrument, a short version was developed consisting of 14 items (OHIP-14)
Summary
It has been recognized that objective indicators are important when evaluating oral diseases or treatment outcomes [1,2]. To assess OHRQoL, several instruments have been developed over the last decades [3]. The original English version of this instrument consists of 49 items representing 7 conceptual domains (functional limitation, physical pain, psychological discomfort, physical disability, psychological disability, social disability and handicap). Several studies have demonstrated that this instrument has good psychometric properties (reliability and validity) with a reasonable degree of cross-cultural consistency [6,7,8,9,10]. To decrease the time needed for completion of the instrument, a short version was developed consisting of 14 items (OHIP-14). In spite of the limited number of items the short version of the OHIP has been proven to be a valid and reliable instrument [11].
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