Radhika Desai1, Justin Durham2, Robert W Wassell2, Philip M Preshaw3. 1. School of Dental Sciences, Centre for Oral Health Research, Newcastle University, Newcastle upon Tyne, UK. Electronic address: r.s.desai@newcastle.ac.uk. 2. School of Dental Sciences, Centre for Oral Health Research, Newcastle University, Newcastle upon Tyne, UK. 3. School of Dental Sciences and Institute of Cellular Medicine, Centre for Oral Health Research, Newcastle University, Newcastle upon Tyne, UK.
Abstract
OBJECTIVE: To determine if there are differences in outcome scores if the Oral Health Impact Profile-49 (OHIP-49) is delivered by two different modes of administration (manual-self complete versus telephone interview). METHODS: Patients with chronic periodontitis (n=83, 54% females and 46% males, mean age 49.1±9.5 years) completed the OHIP-49 using two modes of administration (manual self-complete and telephone interview) in a randomly assigned order, with a minimum washout period of 2 weeks between modes, both episodes occurring prior to any periodontal treatment being provided. To assess convergent validity, after each mode of administration, the patients were additionally asked a global question about their oral health-related quality of life (OHRQoL). RESULTS: Median OHIP-49 scores recorded by manual self-complete (median 36 [IQR=20-70]) were significantly higher than those recorded by telephone interview (median 27 [IQR=11-61]) (p<0.01). The global question was well correlated to the OHIP domains, but did not reveal any evidence of an order effect such as was seen with OHIP-49 itself (which showed a higher impact on OHRQoL during the first administration in either mode). CONCLUSIONS: The mode of administration (manual-self complete versus telephone interview) did substantially influence the OHIP-49 scores in patients with chronic periodontitis. The OHRQoL differed between the two modes of administration, with significantly higher scores (indicating poorer OHRQoL) when the questionnaire was manually self-completed. CLINICAL SIGNIFICANCE: The mode of administration of quality of life questionnaires such as OHIP-49 could potentially affect the outcome scores derived. This study investigated whether there is a difference in outcome scores if OHIP-49 is delivered via manual self-complete or by telephone interview in patients with chronic periodontitis. We found that there was a significant difference between the two modes: manual self-completion by the patients yielded significantly higher scores than completion by telephone interview. It is therefore important to be consistent in the mode of completion of OHIP-49, as mixing modes could introduce additional error into clinical studies that utilise this instrument.
OBJECTIVE: To determine if there are differences in outcome scores if the Oral Health Impact Profile-49 (OHIP-49) is delivered by two different modes of administration (manual-self complete versus telephone interview). METHODS: Patients with chronic periodontitis (n=83, 54% females and 46% males, mean age 49.1±9.5 years) completed the OHIP-49 using two modes of administration (manual self-complete and telephone interview) in a randomly assigned order, with a minimum washout period of 2 weeks between modes, both episodes occurring prior to any periodontal treatment being provided. To assess convergent validity, after each mode of administration, the patients were additionally asked a global question about their oral health-related quality of life (OHRQoL). RESULTS: Median OHIP-49 scores recorded by manual self-complete (median 36 [IQR=20-70]) were significantly higher than those recorded by telephone interview (median 27 [IQR=11-61]) (p<0.01). The global question was well correlated to the OHIP domains, but did not reveal any evidence of an order effect such as was seen with OHIP-49 itself (which showed a higher impact on OHRQoL during the first administration in either mode). CONCLUSIONS: The mode of administration (manual-self complete versus telephone interview) did substantially influence the OHIP-49 scores in patients with chronic periodontitis. The OHRQoL differed between the two modes of administration, with significantly higher scores (indicating poorer OHRQoL) when the questionnaire was manually self-completed. CLINICAL SIGNIFICANCE: The mode of administration of quality of life questionnaires such as OHIP-49 could potentially affect the outcome scores derived. This study investigated whether there is a difference in outcome scores if OHIP-49 is delivered via manual self-complete or by telephone interview in patients with chronic periodontitis. We found that there was a significant difference between the two modes: manual self-completion by the patients yielded significantly higher scores than completion by telephone interview. It is therefore important to be consistent in the mode of completion of OHIP-49, as mixing modes could introduce additional error into clinical studies that utilise this instrument.
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