Table 3.

Association of primary complaint and past medical history with median times

	Median times (minutes)*
	Chest pain primary complaint			History of Diabetes Mellitus			History of cardiovascular disease
Interval	Yes	No	P-value†	No	Yes	P- value†	No	Yes	P- value†
Symptom onset to 9-1-1 call (n=677)	54	37	<0.01	50	60	0.02	56	50	0.03
EMS arrival to out-of-hospital ECG (n=49,061)	13.5	17	<0.01	n/a‡	n/a‡		n/a‡	n/a‡
Scene time (n=859)	19	21	0.89	19	21	0.47	19	20.5	0.35
Hospital arrival to balloon inflation (n=301)	63	53	0.85	61	67	0.41	60	66.5	0.49
Medical contact to balloon inflation (n=298)	94	85.5	0.78	94	97	0.46	92.5	97	0.47
Symptom onset to balloon inflation (n=252)	158	122	0.16	156	159	0.81	159	152	0.07

Abbreviations: EMS, emergency medical services; ECG, electrocardiogram

^*Median times are unadjusted

^†P-values are adjusted for age, race/ethnicity, presence of chest pain as the primary complaint, day of week, time of day, past medical history of cardiovascular disease and past medical history of diabetes mellitus

^‡Data on race, ethnicity and past medical history not available for all participants receiving an out-of-hospital ECG