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Table 1 Characteristics of HEMS missions to islands and the mainland in the period 1 October 2014–30 September 2017, N (%)

From: Helicopter emergency medical services missions to islands and the mainland during a 3-year period in Denmark: a population-based study on patient and sociodemographic characteristics, comorbidity, and use of healthcare services

Variable Islands
N = 1,023
Mainland
N = 4,753
Total
N = 5,776
Missions, total    
 Attended
 Transported
100 (9.8)
923 (90.2)
1,802 (37.9)
2,951 (62.1)
1,902 (32.9)
3,874 (67.1)
Mission duration in minutes, median (Q1,Q3) 113 [94,138] 98 [61,128]
Season    
 Autumn
 Winter
 Spring
 Summer
228 (22.3)
138 (13.5)
255 (24.9)
402 (39.3)
1,080 (22.7)
851 (17.9)
1,356 (28.5)
1,466 (30.8)
1,308 (22.7)
989 (17.1)
1,611 (27.9)
1,868 (32.3)
Time of day (shift)    
 Daytime
 Evening
 Nighttime
494 (48.3)
394 (38.5)
135 (13.2)
2,665 (56.1)
1,617 (34.0)
471 (9.9)
3,159 (54.7)
2,011 (34.8)
606 (10.5)
NACA score as assessed by HEMS staff    
 0 No injury or disease, missing
 1 Minor disturbance—no intervention
 2 Slight/moderate disturbance
 3 Moderate/severe disturbance
 4 Serious/potential life-threatening disorder
 5 Acute life-threatening disorder
 6 Acute life-threatening disorder incl manifest organ failure
 7 Death
5 (0.5)
20 (2.0)
120 (11.7)
523 (51.1)
264 (25.8)
42 (4.1)
26 (2.5)
23 (2.2)
15 (0.3)
70 (1.5)
333 (7.0)
1,240 (26.1)
1,609 (33.9)
543 (11.4)
474 (10.0)
469 (9.9)
20 (0.4)
90 (1.6)
453 (7.8)
1,763 (30.5)
1,873 (32.4)
585 (10.1)
500 (8.7)
492 (8.5)
Naca score as assessed by HEMS staff, dichotomized
 NACA 0–3, non-critical emergency, total
  NACA 0–3, non-critical emergency, island tourists
  NACA 0–3, non-critical emergency, island inhabitants
 NACA 4–7, critical emergency, total
  NACA 4–7, critical emergency, island tourists
  NACA 4–7, critical emergency, island inhabitants
668 (65.3)
 199 (71.6)
 426 (63.3)
355 (34.7)
 79 (28.4)
 244 (36.4)
1658 (34.9)


3095 (65.1)

2326 (40.3)


3450 (59.7)

Disease category
 Cardiovascular
 Trauma
 Neurology
 Other
 Missing
285 (27.9)
157 (15.4)
154 (15.1)
356 (34.8)
71 (6.9)
2,030 (42.7)
1,212 (25.5)
766 (16.1)
591 (12.4)
154 (3.2)
2,315 (40.1)
1,369 (23.7)
920 (15.9)
947 (16.4)
225 (3.9)
Interventions performed during contact*
 Intubation
 Blood transfusion
 I.O access
 Ultrasound examination
 Mechanical chest compression
 Thoracotomy (too few to report)
61 (6.0)
7 (0.7)
10 (1.0)
82 (8.0)
21 (2.1)
1,051 (22.1)
141 (3.0)
321 (6.8)
1,125 (23.7)
379 (8.0)
1,112 (19.3)
148 (2.6)
331 (5.7)
1,207 (20.9)
400 (6.9)
  1. *Percentages of cases that had the intervention performed (does not add up to 100%)