IADR Abstract Archives
A 7-day Recall Period for Clinical Application of the OHIP
Objectives: To investigate validity and reliability of Oral Health Impact Profile (OHIP) scores with a 7-day recall period (SDRP) in international prosthodontic patients from six countries (Croatia, Germany, Hungary, Japan, Slovenia, Sweden) and to compare the results with OHIP scores based on a one-month recall period (OMRP).
Methods: Six consecutive samples of 22 to 59 patients per country (267 patients all together; mean age±SD: 54.0±17.2 years, 58% women) completed the OHIP twice (once with a SDRP and once with an OMRP) within two weeks in a randomized order when patients’ OHRQoL was considered stable. OHIP scores using the new SDRP were correlated with OHIP scores using the standard OMRP. For each recall period, a validity coefficient was calculated as a Spearman rank correlation coefficient between OHIP summary scores and a 5-point ordinal measure of self-reported oral health status. Test-retest reliability was calculated as an intraclass correlation coefficient (ICC) based on a one-way ANOVA of the two recall periods’ OHIP scores.
Results: Mean OHRQoL impairment differed from 16.2±23.5 in Sweden up to 49.2±42.1 in Germany with an average of 35.2±32.4 (first occasion) to 36.2±30.8 OHIP points (second occasion) for the entire study population. OHIP summary scores of both recall versions were highly correlated with coefficients ranging from r=0.73 to 0.98 with an average of 0.97. Validity coefficients ranged from rS=0.38 to 0.77 with an average of 0.64 for the SDRP and 0.59 for the OMRP. ICC ranged from 0.72 for Japan up to 0.96 for Croatia, Germany, and Hungary, with an average of 0.95.
Conclusions: OHIP scores using the new SDRP were valid and reliable when assessed in international prosthodontic patients.
Clinical relevance: Conceptual advantages and a slightly higher validity coefficient make a SDRP a preferred frame of reference in clinical applications of the OHIP questionnaire.
Methods: Six consecutive samples of 22 to 59 patients per country (267 patients all together; mean age±SD: 54.0±17.2 years, 58% women) completed the OHIP twice (once with a SDRP and once with an OMRP) within two weeks in a randomized order when patients’ OHRQoL was considered stable. OHIP scores using the new SDRP were correlated with OHIP scores using the standard OMRP. For each recall period, a validity coefficient was calculated as a Spearman rank correlation coefficient between OHIP summary scores and a 5-point ordinal measure of self-reported oral health status. Test-retest reliability was calculated as an intraclass correlation coefficient (ICC) based on a one-way ANOVA of the two recall periods’ OHIP scores.
Results: Mean OHRQoL impairment differed from 16.2±23.5 in Sweden up to 49.2±42.1 in Germany with an average of 35.2±32.4 (first occasion) to 36.2±30.8 OHIP points (second occasion) for the entire study population. OHIP summary scores of both recall versions were highly correlated with coefficients ranging from r=0.73 to 0.98 with an average of 0.97. Validity coefficients ranged from rS=0.38 to 0.77 with an average of 0.64 for the SDRP and 0.59 for the OMRP. ICC ranged from 0.72 for Japan up to 0.96 for Croatia, Germany, and Hungary, with an average of 0.95.
Conclusions: OHIP scores using the new SDRP were valid and reliable when assessed in international prosthodontic patients.
Clinical relevance: Conceptual advantages and a slightly higher validity coefficient make a SDRP a preferred frame of reference in clinical applications of the OHIP questionnaire.