Skip to main content

Table 1 Patients’ characteristics according to severe burn patient volume (multiple imputed cohort)

From: Volume-outcome relationship on survival and cost benefits in severe burn injury: a retrospective analysis of a Japanese nationwide administrative database

Variables Annual severe burn patients ≤ 5 Annual severe burn patients > 5
Number of hospitals, n 697 40
Number of patients, n 3648 1602
Transferred from another hospital, n (%) 999 (27.4) 539 (33.6)
Year of injury
 2010–2012 1722 (47.2) 756 (47.2)
 2013–2015 1926 (52.8) 846 (52.8)
Age, years, median [IQR] 67 [44, 80] 64 [43, 79]
Female sex, n (%) 1514 (41.5) 625 (39.0)
Charlson comorbidity index, median [IQR] 0 [0, 1] 0 [0, 0]
Levels of consciousness, alert, n (%) 2459 (67.4) 913 (57.0)
Burn index, median [IQR] 15 [10.5, 24.7] 20 [12.5, 35]
Prognostic burn index, median [IQR] 86 [64, 99.5] 90 [68, 106]
Inhalation injury, n (%) 560 (15.4) 331 (20.7)
Interventions performed within 2 days of admission
 Intensive care unit, n (%) 2033 (55.7) 1367 (85.3)
 Mechanical ventilation, n (%) 1011 (27.7) 752 (46.9)
 Escharotomy, n (%) 241 (6.6) 241 (15.0)
 Vasopressor, n (%) 532 (14.6) 342 (21.3)
 Haptoglobin, n (%) 267 (7.3) 277 (17.3)
 RBC transfusion, n (%) 202 (5.5) 130 (8.1)
Skin transplant during hospitalization, n (%) 1583 (43.4) 909 (56.7)
 Artificial graft use, n (%) 314 (8.6) 292 (18.2)
 Cultured graft use, n (%) 108 (3.0) 136 (8.5)
Hospital characteristics
 A government-approved advanced hospital, n (%) 848 (23.2) 732 (45.7)
 Number of ICU bed, median [IQR] 3.7 [0, 6.4] 4.9 [3.5, 9.5]
 Proportion of transferred patients of a treating hospital, median [IQR] 24.0 [10.5, 39.3] 32.1 [17.2, 46.9]
  1. IQR interquartile range, RBC red blood cell, ICU intensive care unit