Table 1. Baseline Characteristics of the Cohort

CovariatesNValue
Data are presented as % or mean (SD). FPL indicated federal poverty level.
Distance characteristics, miles
    EMS depot to scene56500.9 (0.45)
    Scene to hospital53214.05 (3.3)
Time characteristics
    Rush hour, morning58878.7
    Rush hour, evening58878.5
    Weekday588775.3
Patient characteristics
    Age, years455657.9 (17.7)
    Female588750.8
    Race/ethnicity5887
        White49.9
        Black32.1
        Latin/Hispanic8.8
        Asian/Pacific Islander2.6
        Native American2.4
        Other1.2
        Unknown3.0
    Diastolic blood pressure, mm Hg516689.3 (21.3)
    Systolic blood pressure, mm Hg5370148.9 (34.2)
    Pulse, beats/min582487.1 (41.1)
    Respiratory rate, breaths/min571618.0 (6.7)
Neighborhood characteristics
    Population density, ×1000 residents/square mile58655.3 (2.8)
    Race, % white586543.9 (30.4)
    Birthplace, % foreign-born586516.4 (15.5)
    Income, % households <200% FPL586535.6 (22.7)