Table 2 Demographics and admission information of two cohorts
Characteristics | Negative | Positive | P values |
|---|---|---|---|
In Cohort 1, n (%) | 39,897 (81.79) | 8,883 (18.21) | Â |
Age, year, median [Q1, Q3] | 65 [52, 78] | 69 [58, 79] | <0.001 |
Gender, male, n (%) | 22,090(55.37) | 5314(59.82) | < 0.001 |
Race, n (%) | < 0.001 | ||
 Unknown | 4126(10.34) | 1147(12.91) |  |
 White | 29,161(73.09) | 6357(71.56) |  |
 Black | 3232(8.1) | 707(7.96) |  |
 Hispanic | 1365(3.42) | 235(2.65) |  |
 Asian | 916(2.3) | 207(2.33) |  |
 Other | 1097(2.75) | 230(2.59) |  |
Type of hospital admission, n (%) | < 0.001 | ||
 Elective | 5473(13.72) | 1726(19.43) |  |
 Urgent | 976(2.45) | 269(3.03) |  |
 Emergency | 33,448(83.84) | 6888(77.54) |  |
Type of ICU when first admitted, n (%) | < 0.001 | ||
 Coronary Care Unit | 5659(14.18) | 1394(15.69) |  |
 Cardiac Surgery Recovery Unit | 6032(15.12) | 2889(32.52) |  |
 Medical Intensive Care Unit | 15,855(39.74) | 2693(30.32) |  |
 Surgical Intensive Care Unit | 6970(17.47) | 1171(13.18) |  |
 Trauma/Surgical Intensive Care Unit | 5381(13.49) | 736(8.29) |  |
In Cohort 2, n (%) | 25,978 (88.97) | 3,219 (11.03) | Â |
Age, year, median [Q1, Q3] | 67 [54, 79] | 74 [62, 84] | < 0.001 |
Gender, male, n (%) | 13,950 (53.7) | 1715 (53.3) | 0.664 |
Race, n (%) |  |  | < 0.001 |
 Unknown | 1671 (6.4) | 378 (11.7) |  |
 White | 17,247 (66.4) | 2100 (65.2) |  |
 Black | 3835 (14.8) | 378 (11.7) |  |
 Hispanic | 1122 (4.3) | 99 (3.1) |  |
 Asian | 916 (3.5) | 137 (4.3) |  |
 Other | 1187 (4.6) | 127 (3.9) |  |
Type of arrival transport, n (%) |  |  | < 0.001 |
 Unknown | 3106 (11.96) | 550 (17.09) |  |
 Ambulance | 16,100 (61.98) | 2057 (63.90) |  |
 Walk-in | 6397 (24.62) | 550 (17.09) |  |
 Helicopter | 319 (1.23) | 54 (1.68) |  |
 Other | 56 (0.22) | 8 (0.25) |  |
Insurance, Medicare or Medicaid, n (%) | 13,792 (53.09) | 1940 (60.27) | < 0.001 |