Table 1. Characteristics of the ROC Agencies (n = 174).

	n(%)
Organizational structure
Fire department	118 (69%)
Governmental, nonfire	27 (16%)
Private, nonhospital	12 (7%)
Other	14 (8%)
Missing	3 (2%)
Number of vehicles
1–5	53 (31%)
6–10	39 (23%)
11–50	70 (41%)
51+	10 (6%)
Missing	2 (1%)
Service
ALS/BLS	122 (71%)
BLS only	50 (29%)
Missing	2 (1%)

The characteristics of the included agencies were obtained from the ROC EMS Structures Database, which houses the responses to a “structures survey” that each EMS agency submitted at the start of the consortium.

ALS = advanced life support; BLS = basic life support; EMS = emergency medical services; ROC = Research Outcomes Consortium.