A German version of the Oral Impacts of Daily Performances—reliability and validity

Objective The Oral Impact of Daily Performances (OIDP) is a dental patient–reported outcome measure (dPROM) for the estimation of oral health–related quality of life (OHRQoL) and takes the frequency as well as the severity of problems into account; however, it is not available in German language. The aim of this study was, therefore, to evaluate the reliability and validity of the German version of the OIDP in patients of a private practice. Material and methods Translation of the original OIDP version was performed by a forward–backward process. Reliability was evaluated in terms of construct stability (test–retest) for the single items and the sum scores. The responsiveness to change in oral health status was assessed by pre- and post-treatment comparison, in addition. Validity was assessed as convergent validity in comparison with other dPROMs (OHIP-14; GOHAI) and objective dental findings. Results A total of 330 patients participated in this study (mean age: 42.0 (18.0)). The OHRQoL of the participants was relatively high (OIDP score 4.3 (SD 14.3), OHIP score 4.8 (SD 5.3), GOHAI score 54.2 (SD 5.4)). A moderate construct stability for the total OIDP-score (ICC 0.686) was found whilst reliability for the single items varied between 0.179 (social contact) to 0.559 (showing teeth). Significant correlations were found for OIDP and OHIP ( p < 0.001; r = 0.361) and OIDP and GOHAI ( p < 0.001; r = − 0.391) indicating moderate validity with a tendency to even stronger correlations for OIDP-s and OIDP-f ( r ≥ 0.500). Conclusions The German version of the OIDP demonstrated sufficient reliability and validity. OIDP’s general performance should be interpreted cautiously as the outcome was detected in a specifically healthy population. Clinical relevance The OIDP is yet the only dPROM that evaluates both severity as well as frequency which makes validation interesting regarding specific target populations.