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Table 1 Descriptive summary of study population: US casualties transported from point-of-injury to MTF via MEDEVAC (%, 95 CI (count) or median [IQR])

From: Impact of prehospital medical evacuation (MEDEVAC) transport time on combat mortality in patients with non-compressible torso injury and traumatic amputations: a retrospective study

Item

All (n = 669)

AMP + NCTI (n = 72)

AMP (n = 104)

Non-AMP/NCTI (n = 493)

P value

Male

99, 98–100 (661/665)

100, 95–100 (72/72)

100, 96–100 (103/103)

99, 98–100 (486/490)

0.2935

Age (year)

24 [22–28]

23 [21–27]

24 [21–27]

24 [22–28]

0.1128

Injury to MTF (min)

41 [31–56]

34 [28–45]

34 [27–46]

44 [33–59]

< 0.0001

9-Line to MTF (min)

36 [29–47]

32 [25–40]

32 [27–44]

38 [30–51]

< 0.0001

Injury description*

 Blast

72, 69–76 (484/669)

100, 95–100 (72/72)

95, 89–98 (99/104)

63, 59–68 (313/493)

< 0.0001

 Penetrating

26, 23–30 (177/669)

0, 0–5 (0/72)

4, 2–9 (4/104)

35, 31–39 (173/493)

< 0.0001

 Blunt

1, 0.6–2 (8/669)

0, 0–5 (0/72)

1, 0.2–5 (1/103)

1, 0.6–3 (7/493)

0.7749

ISS (score)

17 [12–27]

33 [25–40]

18 [14–27]

17 [12–24]

< 0.0001

GCS of 3

3, 2–5 (17/552)

2, 0.2–8 (1/65)

3, 1–9 (3/89)

3, 1–6 (13/398)

0.7042

Head injury (AIS of head ≥2)

65, 56–74 (240/369)

74, 60–85 (32/43)

62, 50–73 (38/61)

64, 52–75 (170/265)

0.1169

Prehospital hypotension (SBP < 90 mmHg)

25, 21–29 (117/472)

47, 35–60 (26/55)

27, 18–37 (22/82)

21, 17–25 (69/335)

0.0015

30-day mortality

5, 3–7 (31/662)

8, 4–17 (6/72)

4, 2–10 (4/103)

4, 3–7 (21/487)

0.3045

  1. AMP+NCTI Traumatic amputation and non-compressible torso injury, AMP Traumatic amputation only, Non-AMP/NCTI Neither traumatic amputation nor non-compressible torso injury, CI Confidence interval, IQR Interquartile range, MTF Medical Treatment Facility, ISS Injury Severity Score, GCS Glasgow Coma Scale, AIS Abbreviated injury scale, SBP Systolic blood pressure; *Blast, penetrating, and blunt are mutually exclusive