Table 2.

Univariate comparison of patients by weight class.

	≤100 kg (N = 6059)	>100 kg (N = 3037)	p-value
Age (years)	66.53	61.98	<0.001
Male sex	59.5%	73.8%	<0.001
Non-Caucasian race	25.9%	24.2%	0.073
Mean weight (kg)	75.93	128.61	<0.001
Aetiology of arrest: Presumed cardiac Respiratory Drug overdose Other	80.8% 12.4% 3.1% 3.7%	83.7% 11.7% 1.7% 2.8%	<0.001
EMS response time (minutes)	8.31	8.54	0.038
Received bystander CPR	30.2%	31.5%	0.229
Used CPR feedback device	37.3%	38.2%	0.443
Initial shockable rhythm	29.3%	32.4%	0.002
Received AED shock prior to EMS arrival	7.1%	7.6%	0.386
Scene arrival to shock for initially shockable rhythms (minutes)	6.17	6.04	0.322
First shock energy (joules)a	229.17	230.92	0.595
Proportion of successful first shocks	20.4%	14.6%	<0.001
Total number of shocks per patient	1.07	1.20	0.006
Received advanced airway placement	77.1%	80.0%	0.002
Scene arrival to first advanced airway placement (minutes)	10.22	10.46	0.211
Scene arrival to IV placement (minutes)	11.04	11.79	0.052
Scene arrival to IO placement (minutes)	7.52	7.40	0.822
Scene arrival to first adrenaline dose (minutes)	9.00	9.31	0.047
First adrenaline dose (mg/kg)	0.013	0.004	<0.001
Total adrenaline dose (mg)	3.71	3.99	<0.001
Total adrenaline dose (mg/kg)	0.050	0.318	<0.001
Total on-scene time (minutes)	30.61	32.52	<0.001
ROSC	46.7%	28.5%	<0.001

^aData on the specific defibrillator models and defibrillation waveforms used were not available.