Table 1: Profiles of good and poor groups of cerebral function following out-ofhospital cardiac arrests.
| Variable | good group(n=20,593) | poor group(n=357,112) | probability |
| n | % | n | % |
| sex | male | 14,617 | (71.0) | 214,206 | (60.0) | <0.01 |
| female | 5,976 | (29.0) | 142,906 | (40.0) | |
| age | 0-39 years old | 2,231 | (10.8) | 19,116 | (5.4) | <0.01 |
| 40-64 | 7,625 | (37.0) | 67,638 | (18.9) | |
| 65-74 | 4,602 | (22.3) | 67,655 | (18.9) | |
| 75-84 | 4010 | (19.5) | 106,800 | (29.9) | |
| 85- | 2,125 | (10.3) | 95,903 | (26.9) | |
| year | 2005-2008 | 8,278 | (40.2) | 165,480 | (46.3) | <0.01 |
| 2009-2012 | 12,315 | (59.8) | 191,632 | (53.7) | |
| hour | 09:00-16:59 | 10,610 | (51.5) | 157,699 | (44.2) | <0.01 |
| season | spring | 4,969 | (24.1) | 88,695 | (24.8) | <0.01 |
| summer | 4,826 | (23.4) | 73,836 | (20.7) | |
| autumn | 5,142 | (25.0) | 84,499 | (23.7) | |
| winter | 5,655 | (27.5) | 110,056 | (30.8) | |
| cardiac disease | 5,295 | (25.7) | 164,440 | (46.0) | <0.01 |
| initial ECG | VT/VF | 11,492 | (55.8) | 318,820 | (89.3) | <0.01 |
| oral instruction | 6,305 | (30.6) | 123,506 | (34.6) | <0.01 |
| BCPR | conventional | 3,598 | (17.5) | 43,888 | (12.3) | <0.01 |
| chest compression | 6,028 | (29.3) | 86,267 | (24.2) | |
| respiration | 184 | (0.9) | 2,900 | (0.8) | |
| none | 10,783 | (52.4) | 224,057 | (62.7) | |
| AED | public | 1,028 | (5.0) | 2,025 | (0.6) | <0.01 |
| EMS | 9,794 | (47.6) | 50,875 | (14.2) | |
| public & EMS | 491 | (2.4) | 1,177 | (0.3) | |
| none | 9,280 | (45.1) | 303,035 | (84.9) | |
| doctor on an ambulance | 3,218 | (15.6) | 43,054 | (12.1) | <0.01 |
| call-contact interval <=10 min | 19,461 | (85.2) | 266,622 | (76.9) | <0.01 |
| call-hospital interval <= 60 min | 17,537 | (94.5) | 342,620 | (95.9) | <0.01 |
| intravenous cannulation | 2,911 | (14.1) | 9,146 | (2.6) | <0.01 |
| adrenalin administration | 946 | (4.6) | 43,045 | (12.1) | <0.01 |