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Table 1 The characteristics of the included patients

From: Earlier point-of-care ultrasound, shorter length of stay in patients with acute flank pain

  Total (n = 888) PoCUS≤120 min (n = 720) PoCUS > 120 min (n = 168) p-value
Age, years* 51(39, 62) 51 (40, 62) 52 (37, 61) 0.857
Male, n (%) 495 (55.7%) 396 (55.0%) 99 (58.9%) 0.356
Body mass index* 24.2 (21.7, 27.4) 24.1 (21.7, 27.3) 24.7 (21.7, 27.6) 0.211
Comorbidity
 Hypertension 190 (21.4%) 150 (20.8%) 40 (23.8%) 0.397
 Diabetes mellitus 103 (11.6%) 84 (11.7%) 19 (11.3%) 0.896
 Hyperlipidemia 72 (8.1%) 59 (8.2%) 13 (7.7%) 0.845
 Chronic kidney disease 34 (3.8%) 28 (3.9%) 6 (3.6%) 0.847
 Coronary artery disease 46 (5.2%) 33 (4.6%) 13 (7.7%) 0.097
 Malignancy 59 (6.6%) 49 (6.8%) 10 (6.0%) 0.689
Vital signs
 Systolic blood pressure, mm-Hg* 141 (127, 159) 141 (126, 160) 142 (127, 155) 0.987
 Diastolic blood pressure, mm-Hg* 80 (71, 90) 81 (71, 90) 80 (70, 90) 0.506
 Heart rate, per min* 82 (72, 94) 82 (71, 94) 82 (73, 94) 0.639
 SpO2, %* 98 (96, 99) 98 (96, 99) 98 (96, 99) 0.174
Weekend/holiday visits, n (%) 291 (32.8%) 230 (31.9%) 61 (36.3%) 0.278
Dayshift visits, n (%) 429 (48.3%) 349 (48.5%) 80 (47.6%) 0.842
Door to Physician time, min* 19 (16,23) 19 (16, 23) 21(16, 26) 0.068
Door to X-ray time, min* 39 (27, 59) 38 (27, 59) 43 (30, 61) 0.117
Door to US time, min* 35 (20, 82) 30 (18, 52) 168 (144, 237)  < 0.0001
Door to urinalysis time, min* 59 (42, 90) 60 (42, 89) 57 (43, 94) 0.267
Patients receiving CT, n (%) 129 (14.5%) 97 (13.5%) 32 (19.0%) 0.065
Length of stay, min* 146 (100, 255) 128 (95,221) 217 (161,625)  < 0.0001
ED discharge, n (%) 805 (90.7%) 655 (91.0%) 150 (89.3%) 0.499
  1. *Presented as median and interquartile ranges (IQRs)
  2. US ultrasonography, CT computed tomography, ED emergency department, PoCUS point-of-care ultrasound
  3. Comparisons between patients with door to ultrasound time less than 120 min and more than 120 min