Development of a Remote Examination of Deglutition Based on Consensus Surveys of Clinicians (Part II): Reliability and Validity in Healthy Elderly Individuals and Oral Cancer Patients

In our prior published study, we extracted evaluation items suitable for remote administration, and made a relatively simple Remote Examination of Deglutition (RED). This study aimed at verifying the reliability and validity of RED. The participants were 21 healthy elderly individuals and 72 postoperative oral cancer (OC) patients. OC patients underwent videofluoroscopic dysphagia examination, and severity was judged on the dysphagia severity scale (DSS). Reliability and validity of RED were examined in all participants under face-to-face conditions, in comparison with the Mann Assessment of Swallowing Ability (MASA). Reliability and validity of remote administration of RED were examined in 40 participants. ROC curves were used to find cut-off RED scores to predict aspiration and deglutition disorders. The Cronbach's alpha coefficient for the items was 0.882. There was a high correlation between the total score of RED and MASA in the face-to-face condition. When RED score was compared among different severity groups (DSS1–4, DSS5–6, and DSS7), the total and oral preparatory stage scores revealed significant group differences. The area under the curve (AUC) for aspiration based on the ROC curve was 0.913, with a sensitivity/specificity of 0.80/0.98. The AUC for deglutition disorders was 0.819, with a sensitivity/specificity of 0.74/0.67. In both face-to-face and remote conditions, the reliability of RED was good.The reliability and validity of RED were confirmed. RED has shown the potential to assess the likelihood of aspiration and deglutition disorders in OC patients remotely as an initial assessment tool.