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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