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Table 1 Baseline characteristics according to the mode of transportation (ambulance vehicle or helicopter) and according to the distance from the scene of event to the PCI-center (Hospital with primary percutaneous coronary intervention facilities)

From: Earlier reperfusion in patients with ST-elevation Myocardial infarction by use of helicopter

  Group A (0–25 km.) n = 98 Group B (26–50 km.) n = 102 Group C (51–75 km.) n = 101 Group D (>75 km.) n = 75 Group E n = 22 All patients N = 398
Field-triage to PCI-center,% 89% (87/98) 93% (95/102) 83% (84/101) 75% (56/75) 73% (16/22) 85% (338/398)
Distance, scene of event to PCI-center, km † 8 (5–14) 39 (33–47) 61 (53–67) 114 (87–123) 104 (79–128)‡ 50 (26–74)
- Distance among patients field-triaged 8 (5–13) 38 (32–47) 60 (53–67) 115 (102–127) 115 (82–127) 49 (23–69)
- Distance among patients not field-triaged 12 (7–20) 41 (39–47) 67 (56–68) 92 (86–122) 90 (62–129) 67 (42–88)
Health Care System delay, all patients, minutes 82 (70–104) 90 (80–104) 104 (92–122) 141 (125–166) 116 (94–137) 100 (85–134)
- System delay among patients field-triaged 78 (68–93) 89 (79–100) 99 (91–111) 141 (126–156) 107 (94–124) 94 (82–119)
- System delay among patients not field-triaged 161 (141–200) 188 (132–248) 192 (142–220) 160 (120–199) 154 (125–165) 168 (136–216)
Door-to-balloon delay, minutes 34 (24–49) 28 (22–37) 26 (23–38) 31 (23–46) 37 (24–60) 29 (23–43)
  1. †: If transported by ambulance vehicle. ‡: One patient living on an island was not included because distance by ground transportation could not be calculated. Door-to-balloon delay: Delay form arrival at the PCI-center to first coronary intervention. PCI: Percutaneous coronary intervention. Health Care System delay: Delay from Emergency Call to first coronary intervention. Continuous data presented as median (IQR) and categorical data presented as percentage (number/valid cases).