Table 3.
Characteristics of patients with and without a final diagnosis of IWs
| IW | Superficial W | p** | |
|---|---|---|---|
| (n = 95) | (n = 58) | ||
| No pre-hospital sign of IW, n (%) | 25(26) | 34(59) | < 0.01a |
| Correctly classified, n (%) | 70(74) | 34(59) | 0.05a |
| AIS max, med [IQR,25–75%] | 3[3–4] | 1[1–3] | < 0.01b |
| ISS, med [IQR,25–75%] | 9[9–16] | 2[1–4] | < 0.01b |
| Pre-hospital Pulse: first (bpm), mean[95% CI] | 97[92–102] | 99[94–104] | 0.52c |
| Pre-hospital Pulse: maximum (bpm), mean[95% CI] | 101[97–106] | 103[99–107] | 0.23c |
| Pulse at hospital admission (bpm), mean[95% CI] | 104[100–107] | 97[93–101] | < 0.01c |
| Pre-hospital SBP: first (mmHg), mean[95% CI] | 115[110–120] | 125[119–130] | 0.02c |
| Pre-hospital SBP: minimum (mmHg), med [IQR] | 110[90–121] | 121[100–131] | < 0.01b |
| SBP at hospital admission (mmHg), med [IQR] | 126[110–140] | 125[117–142] | 0.40b |
| Pre-hospital RR first (/min), med [IQR] | 20|18–25] | 20[16–25] | 0.74b |
| Pre-hospital RR: minimum (/min), med [IQR] | 20[16–21] | 20[18–25] | 0.64b |
| RR at hospital admission (/min), med [IQR] | 20[17–25] | 18[15–21] | 0.04b |
| Pre-hospital Hb level: first (g/L), mean[95% CI] | 139[136–143] | 144[140–148] | 0.13c |
| Pre-hospital Hb level: Min (g/L), mean[95% CI] | 135[131–139] | 139[134–144] | 0.1c |
| Hb level on admission (g/L), med [IQR] | 131[122–146] | 134[117–143] | 0.26b |
| Pulse oximetry (%): first, med [IQR] | 99[97–100] | 99[98–100] | 0.38b |
| Pulse oximetry at hospital admission (%), med [IQR] | 99[98–100] | 100[97–100] | 0.07b |
| Location of wound | |||
| Cardiac box, n (%) | 60(63) | 41(71) | 0.34a |
| Lateral zone, n (%) | 25(26) | 41(71) | 0.995a |
| Thoracoabdominal zone, n (%) | 60(63) | 32(55) | 0.328a |
| Posterior zone, n (%) | 19(20) | 18(31) | 0.122a |
| Supraclavicular zone, n | 4 | 1 | |
| Number of wounds, med [IQR] | 1 [1–2] | 1[1–2] | 0.5b |
| Extrathoracic wounds, n (%) | 35(37) | 29(50) | 0.11a |
| Abdominal woundsa, n (%) | 13(17) | 10(14) | 0.55a |
| Cervicofacial wounds, n (%) | 14(18) | 10(14) | 0.68a |
| Extremity wounds, n (%) | 24(25) | 21(36) | 0.15a |
Definition: a thoracoabdominal wounds excluded; AIS Abbreviated Injury Scale, ISS Injury Severity Score, SBP Systolic Blood Pressure, RR Respiratory Rate, Hb Haemoglobin
**: p-value for comparison between IWs and superficial wounds
Statistical tests: b = chi-squared test;c = Mann-Witney U test; c = t test