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Table 1 Characteristics of the 97 included patients

From: Predictive value of a false-negative focused abdominal sonography for trauma (FAST) result in patients with confirmed traumatic abdominal injury

Variable All patients (n = 97) Patients with false-negative FAST (n = 40) Patients with true-positive FAST (n = 57) P value
Age (years), median ± IQR (range) 34.0 ± 34.0 (6.0–89.0) 44.5 ± 46.0 (10.0–89.0) 27.0 ± 29.0 (6.0–86.0) 0.005
Male gender, n (%) 59 (60.8) 21 (52.5) 38 (66.7) 0.206
Blunt abdominal trauma, n (%)a 94 (96.9) 39 (97.5) 55 (96.5) 0.312
Code red level of urgency, n (%)b 45 (45.9) 15 (37.5) 30 (52.6) 0.239
Low hemoglobin levels, n (%)a 54 (55.7) 16 (40.0) 38 (66.7) 0.015
Heart rate (beats per minute), mean ± SD (range) 93 ± 20 (50–155) 94 ± 19 (57–155) 92 ± 21 (50–133) 0.748
Systolic blood pressure (mmHg), mean ± SD (range) 116 ± 22 (66–166)c 121 ± 20 (85–160)d 112 ± 23 (66–166)e 0.498
Class 1 shock index (no shock), n (%) 15 (15.5) 7 (17.5) 8 (14.0) 0.195
Class 2 shock index (mild shock), n (%) 57 (58.8) 24 (60) 33 (57.9)
Class 3 shock index (moderate shock), n (%) 19 (19.6) 9 (22.5) 10 (17.5)
Class 4 shock index (severe shock), n (%) 6 (6.2) - 6 (10.5)
Extra-abdominal injury, n (%) 75 (77.3) 33 (82.5) 42 (73.7) 0.337
Time between FAST and abdominal CT (minutes), median ± IQR (range)b 28.5 ± 31 (7–4337) 31.5 ± 84 (7–4337) 25 ± 23.5 (7–270) 0.029
Hospitalization (days), median ± IQR (range) 12.0 ± 17.0 (0.0–70.0) 12.0 ± 16 (0.0–70.0) 12.0 ± 19.0 (0.0–59.0) 0.949
  1. Significant p values (p < 0.05) are shown in italics
  2. IQR interquartile range
  3. aOne case missing for this variable
  4. bSix cases missing for this variable
  5. bThirteen cases has a systolic blood pressure below 90 mmHg
  6. dThree cases has a systolic blood pressure below 90 mmHg
  7. eTen cases has a systolic blood pressure below 90 mmHg