Nine golden codes: improving the accuracy of Helicopter Emergency Medical Services (HEMS) dispatch—a retrospective, multi-organisational study in the East of England

Table 4 Variables associated with significant high or low rates of HEMS patient contact (multivariate model)

AMPDS category/n	Night (ref: day)	RRV (ref: helicopter)	Dispatch desk CCP (ref: no CCP)
AMPDS category/n	Adjusted odds ratio (95% confidence interval)
06–Breathing problems n = 902	0.6 (0.4–0.8)	ns	ns
07—Burns n = 361	0.5 (0.3–0.9)	0.5 (0.3–0.8)	ns
09—Cardiac/respiratory n = 5299	0.8 (0.7–0.9)	0.8 (0.7–0.9)	ns
10–Chest pain n = 347	0.3 (0.1–0.4)	ns	ns
12—Convulsions/fitting n = 1183	ns	ns	ns
17—Falls n = 2491	0.5 (0.4–0.7)	0.8 (0.6–0.9)	ns
27—Stab/gunshot n = 1532	0.7 (0.6–0.9)	ns	1.6 (1.1–2.5)
29—RTC n = 4951	0.8 (0.7–0.9)	0.8 (0.7–0.9)	ns
30—Traumatic injuries n = 1114	ns	0.5 (0.4–0.7)	ns
31—Unconscious/fainting n = 1204	0.6 (0.5–0.8)	ns	ns

HEMS Helicopter Emergency Medical Service, AMPDS Advanced Medical Priority Dispatch System, RRV rapid response vehicle, CCP critical care paramedic, ns not significant (p-value ≥ 0.05). An odds ratio < 1 is a reduced chance of the outcome (not highlighted bold); an odds ratio > 1 is an increased chance of the outcome (highlighted bold)

ISSN: 1757-7241