Incidence of overtriage and undertriage and associated factors: A cross-sectional study using a secondary data analysis

Background: Improving triage accuracy for accurate patient identification and appropriate resource allocation is essential. Little is known about the trend of triage accuracy, and factors associated with mistriage vary from study to study.Aim: To identify incidence and risk factors of mistriage, such as overtriage and undertriage.Design: This is a cross-sectional study.Methods: The data came from the National Emergency Department Information System database in 2016-2020. All patients 15 years and older visiting emergency departments in Korea were assessed for eligibility, and 20,641,411 emergency patients' data were used. Multivariable logistic regressions were conducted to confirm the associated factors with overtriage and undertriage compared to expected triage. Demographic characteristics, disease-related signs and triage-related factors were independent variables.Results: Expected triage decreased from 96.8% in 2016 to 95.7% in 2020. Overtriage (0.5%-0.7%) and undertriage (2.4%-3.3%) increased. The occupation that performed triage the most (over 85%) was nurses. Associated factors with overtriage were demographic characteristics (40-64 age group, female), disease-related signs (known disease, direct visit) and triage-related factors (regional emergency medical centre). Risk factors to undertriage were disease-related signs (systolic/diastolic blood pressure and pulse rates within normal range).Conclusions: While the acuity degree remained within the recommended range, the accuracy of triage decreased, and there was a gradual increase in mistriaged cases. Nurses have performed most of the triage and played a key role in expected triage. Associated factors with overtriage were demographic characteristics, disease-related signs and triage-related factors and risk factors to undertriage were disease-related signs.Patient or public contributionNo patient or public contribution.Implications for the professionNurses should be aware of what factors are associated with mistriage and why the factors cause mistriage to improve the triage accuracy because they are responsible for the majority of the triage assessments.