Factors related to changes in severity among adult and older adult patients at an internal medicine department clinic: an embedded mixed-method study.

The changes in aging plus the pathology of diseases can influence the changes in severity levels. This study aimed to examine the changes in levels of severity in patients while waiting to see a doctor. The study was conducted at an outpatient clinic in northeastern Thailand with a total of 421 patients who were assessed twice for levels of severity using the Emergency Severity Index. The 38 triage nurses screened patients, and 18 were interviewed when severity level changes were observed. Data were collected April 1-30, 2021. Quantitative data were analyzed by Chi-square test, Fisher's exact test, and logistic regression. Qualitative data were analyzed by content analysis. Most patients were female, between 18 and 59 years old. Most patients did not change their level of severity. However, increasing levels of severity were found in older adults. Factors related to the changes in severity levels were age group, chronic disease, chief complaint, educational level, the duration of travel to the outpatient clinic, type of vehicle, aging process and comorbidity, pathology of diseases, reassessment interval, nurse's experience, bypassing the patient triage process, patient's self-preparation, management of triage nurses, and assignment of direct healthcare staff until the end of the treatment. Increased severity was more frequently found in older adults, so closely monitored during waiting times at a clinic is needed. Setting rescreening as a policy and having sensitive screening guidelines and tools specific to older adults would contribute to early detection and immediate treatment of deteriorating symptoms and illness to help reduce complications and morbidity.Trial registration: https://osf.io/fp3j2 .