Table 3.

Measures for dispatch accuracy per included study

Category	Author, year	Sensitivity % (95% CI)	Specificity % (95% CI)	PPV % (95% CI)	NPV % (95% CI)	Over-triage % (95% CI)	Under-triage % (95% CI)
Stroke	Clawson et al., 2016	86.4	26.6	20.0	90.2
	Dami et al., 2017	67.8 (54.3–79.4)	98.6 (98.4–98.7)	9.4 (6.6–12.	99.9 (99.9–99.9)
	Malekzadeh et al., 2015					11.6 vs 20.8	10.7 vs 13.6
	Krebes et al., 2012	Stroke: 53.3 (47.0–59.0)	97 (97–98)	Stroke: 47.8 (42.0–54.0)	98 (97–98)
	Viereck et al., 2016	66.2 (64.4–68.0)		30.2 (29.1–31.4)
Cardiac arrest	Deakin et al., 2017	75.9 (74.3–77.3)	98.6 (98.6–98.7)	26.8 (25.88–27.7)	99.8 (99.82–99.85)
	Möller et al., 2016	Copenhagen 80.7 (77.7–84.3), Skåne 86.0 (81.3–89.8)
	Fukushima et al., 2015	93	50
	Tanaka et al., 2014	72.9 (71.7–74.1)	99.6 (99.6–99.6)
	Vaillancourt et al., 2015	65.9 (63.5–68.2)	32.3 (29.0–35.9)	67.4	30.9
Acute coronary syndrome	Gellerstedt et al., 2016	82.6
Major trauma	Giannokopoulos et al., 2012	87.7	45.3	48.4	86.3	44	20.6
	Wilmer et al., 2015	MOI + INT: 80.2				MOI: 41.2	REQ/all: 19.7
						INT: 30.2
						REQ: 27.7
Medical priority	Ball et al., 2016	93.32 (92.71–93.89)	48.6 (48.45–48.89)
	Dami et al., 2015	86 (85.6–86.4)	48 (47.4–48.6)	21.7 (21.2–22-2)	95.4 (95.2–95.6)	78	4.6
	Ek et al., 2013	93.32	15.4
	Leopardi et al., 2013	78.0 (76.9–79.1)	83.8 (83.4–84.1)	36.6 (35.8–37.5)	96.9 (96.8–97.1)
	Moser et al., 2017	A + B 86.8 (86.5–87.1)	A + B 67.4 (66.9–67.9)	29.2 (28.7–29.7)	97.0 (70.3–71.3)	After 70.8 (70.3–71.3)	After 3.0 (2.8–3.2)

CI Confidence Interval, DPCI Dispatch Priority Card Index, HEMS Helicopter Emergency Medical Service, INT Paramedic interrogation of caller, MPDS Medical Priority Dispatch System, MOI Mechanism of injury, NHS National Health System, NPV Negative Predicted Value, PPV Positive Predicted Value, REQ Land ambulance request