CTAS scores determined by paramedics on arrival at the emergency department were compared with the initial ESI scores determined by emergency nurses. Both scores were compared with the patient’s disposition status. Data analyses included descriptive statistics, χ2 statistics, and hierarchical regression analysis.
The analysis included 2,222 patients. There was a poor relationship between the CTAS and the ESI at the facility (P = .599, κ = –0.003). The final regression model explained 32.9% of the admission variance (P < .001). The model correctly predicted 61.5% of admissions, with an 82% accuracy rate for all other forms of disposition and an overall model prediction rate of 73.7%.
Using the CTAS, paramedics can predict admission comparably with nurses using the ESI. However, both instruments showed weakness in over- and under-triage rates. Additional studies are indicated to better understand prehospital paramedic triage and its impact on throughput.
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