A comparison of OHIP 14 and OIDP as interviews and questionnaires

To assess the completion rates and concurrent validity of the Oral Impacts on Daily Performance (OIDP) and the short form of the Oral Health Impact Profile (OHIP 14) in both questionnaire and interview formats.

Cross sectional social and clinical study. Clinical setting Dental teaching hospital primary care department in London UK. Participants Two week consecutive sample of 183 patients attending setting.

came from 19 ethnic groups, 53% were men and 32% had attended for a dental emergency.

Completion rates and concurrent validity for each instrument and in each format.

Completion rates for OHIP 14 and OIDP were similar in interview format. In questionnaire format usable data were provided on 92.9% of the OHIP 14 but only 86.5% of the OIDP questionnaires. Completion of both questionnaires was related to ethnicity. The number of impacts for both measures and total impact scores for OHIP 14 were related to the age of the participants, the presence of oral disease and the order of administration of the instruments. Analysis of the total score for OIDP was weakened by the severe skewness of these data.

The psychometric properties of OHIP 14 and OIDP were not related to the method of administration. However, the use of OIDP in this questionnaire format may result in loss of data, particularly from people who are not White English.