Table 2.
Association of demographic variables with median times
| Median times (minutes)* | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Sex | Age group, years | Race/ethnicity | |||||||||
| Interval | Males | Females | P- value* |
<55 | 55–64 | >64 | P- value† |
Non-Hispanic whites |
Minorities | P- value† |
|
| Symptom onset to 9-1-1 call (n=677) | 45 | 73 | <0.01 | 41 | 54 | 56 | 0.4 | 50 | 58 | 0.99 | |
| EMS arrival to out-of-hospital ECG (n=49,061) | 14.5 | 16 | <0.01 | 14.1 | 14.9 | 16.2 | <0.01 | n/a* | n/a | ||
| Scene time (n=859) | 19 | 21 | <0.01 | 19 | 18 | 21 | <0.01 | 19 | 22 | 0.26 | |
| Hospital arrival to balloon inflation (n=301) | 59 | 67 | 0.05 | 63.5 | 56 | 66 | <0.01 | 60.5 | 65.5 | 0.53 | |
| Medical contact to balloon inflation (n=298) | 90.5 | 106.5 | 0.01 | 95.5 | 88 | 97 | <0.01 | 91 | 97 | 0.62 | |
| Symptom onset to balloon inflation (N=252) | 148.5 | 180 | 0.02 | 144 | 157 | 167.5 | 0.09 | 150 | 162.5 | 0.61 | |
Abbreviations: EMS, emergency medical service; 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