C McGrath1, R Bedi. 1. Periodontology and Dental Public Health, Faculty of Dentistry, Philip Dental Hospital, University of Hong Kong, China.
Abstract
OBJECTIVE: The aim was to test the reliability and validity of an instrument used to measure the impact of oral health on quality of life. BASIC RESEARCH DESIGN: The instrument tested was the indicator OHQoL-UK(W), which was developed, based on a general UK population's perceptions of how oral health affects life quality. OHQoL-UK(W) consists of a battery of 16 questions, which takes into account both 'effect' and 'impact' of oral health on life quality, incorporating dimensions and an individualised weighting system. A questionnaire containing the indicator was administered to a sample of 500 adults. Determining associations between OHQoL-UK(W) scores, socio-demographic and self-reported oral health status assessed its construct validity. The criterion validity of the indicator was assessed in the absence of a 'gold standard' by correlating OHQoL-UK(W) scores to self-rating of oral health status. The internal reliability of the indicator was assessed using Cronbach's alpha. RESULTS: The response rate was 78%. Associations between OHQoL-UK(W) scores and self-reported number of natural teeth (P<0.01) and denture status (P<0.01) supported the construct validity of the indicator. In addition, OHQoL-UK(W) scores were associated with socio-demographic factors; age (P<0.05), employment status (P<0.01) and ethnicity (P<0.05). The instrument was also associated with self-rating of oral health status (P<0.01), supporting the criterion validity of the indicator. The internal reliability was high with a Cronbach alpha value of 0.94. CONCLUSION: OHQoL-UK (W) appears to be a valid and reliable measure for assessing the impact of oral health on life quality.
OBJECTIVE: The aim was to test the reliability and validity of an instrument used to measure the impact of oral health on quality of life. BASIC RESEARCH DESIGN: The instrument tested was the indicator OHQoL-UK(W), which was developed, based on a general UK population's perceptions of how oral health affects life quality. OHQoL-UK(W) consists of a battery of 16 questions, which takes into account both 'effect' and 'impact' of oral health on life quality, incorporating dimensions and an individualised weighting system. A questionnaire containing the indicator was administered to a sample of 500 adults. Determining associations between OHQoL-UK(W) scores, socio-demographic and self-reported oral health status assessed its construct validity. The criterion validity of the indicator was assessed in the absence of a 'gold standard' by correlating OHQoL-UK(W) scores to self-rating of oral health status. The internal reliability of the indicator was assessed using Cronbach's alpha. RESULTS: The response rate was 78%. Associations between OHQoL-UK(W) scores and self-reported number of natural teeth (P<0.01) and denture status (P<0.01) supported the construct validity of the indicator. In addition, OHQoL-UK(W) scores were associated with socio-demographic factors; age (P<0.05), employment status (P<0.01) and ethnicity (P<0.05). The instrument was also associated with self-rating of oral health status (P<0.01), supporting the criterion validity of the indicator. The internal reliability was high with a Cronbach alpha value of 0.94. CONCLUSION:OHQoL-UK (W) appears to be a valid and reliable measure for assessing the impact of oral health on life quality.
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