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. 2019 Sep 5;7(1):49. doi: 10.5334/egems.307

Table 1.

Demographic and clinical features compared between the PU and non-PU populations. (Features marked with an asterisk were not used as predictor variables.)

No ulcer (n = 49,161) Ulcer (n = 1,690) P value % missingness

Demographics
  Age (years, mean, SD) 63.7 (17.2) 66.5 (15.4) <0.001 0
  Gender (% male) 56.2 60 0.002 0
  Weight (kg, mean, SD) 83.6 (25) 87.0 (31) <0.001 40
  Ethnicity (%) <0.001 0
    Asian 2.4 1.6
    Black 9.5 7.5
    Hispanic 3.4 2.7
    Other 2.5 1.7
    Unknown 10.5 12.7
    White 71.6 73.8
  Insurance status (%) <0.001 0
    Public 66.6 71.2
    Private 32.3 28.2
    Uninsured 1.2 0.5
Admission
  Length of stay* (days, median, IQR) 2.1 (3) 11.5 (16) <0.001 6
  Time from hospital to ICU admission (days, median, IQR) 0.03 (1) 0.08 (3) <0.001 0
  No prior admission with ulcer (%) 25.4 33.8 <0.001 0
  Admitting ICU ward NA NA <0.001 0
  Stage 1 PU in first 24h (%) 1.2 11.1 <0.001 NA
  Pressure reduction device 1.2 65 <0.001 NA
  Time to ulcer onset* (median, IQR) NA 45 (7.1) NA NA
  Ulcer healing* (%) NA 29.6 NA NA
  Braden score* (median, IQR) 15.0 (4) 13.0 (3) <0.001 47
  Noninvasive ventilation (%) 3.5 3.4 <0.001 0
  Mechanical ventilation (%) 39.4 67.9 <0.001 0
  Mortality within 12 months* (%) 41.6 55.9 <0.001 0
Physiology (mean, SD)
  Glasgow Coma Scale (GCS) 12.3 (13) 9.6 (3.7) <0.001 45
  Mean Arterial Pressure (MAP) (mmHg) 79 (12) 76 (12) <0.001 44
  Oxygen saturation (%) 97 (2) 97 (2) 3 44
  Arterial pO2 (mmHg) 163 (71) 148 (57) <0.001 67
  Arterial pCO2 (mmHg) 41 (9) 41 (10) 0.6 67
  Hemoglobin (g/dL) 10.8 (1.8) 10.3 (1.6) <0.001 6
  Hematocrit (%) 31.8 (5) 30.6 (4) <0.001 37
  White blood cell count 11.8 (9) 13.9 (10) <0.001 11
  Neutrophils (%) 78.8 (15) 79.5 (15) 0.45 11
  Platelet count 218 (111) 218 (125) 0.9 11
  Blood glucose (mg/dL) 138 (50) 148 (57) <0.001 10
  Sodium (mmol/L) 138 (4) 138 (5) 0.1 1
  Potassium (mmol/L) 4.1 (0.6) 4.2 (0.6) 0.3 1
  Creatinine (mg/dL) 1.4 (1.5) 1.8 (1.6) <0.001 1
  BUN (mg/dl.) 24.4 (20) 34.7 (25) <0.001 1
  Albumin (g/dL) 3.1 (1.2) 2.8 (0.6) <0.001 77
  Total bilirubin (mg/dL) 1.9 (4) 2.6 (6) 0.02 70
  Troponin (ng/mL) 1.2 (4) 1.1 (4) 0.7 74
  INR 1.5 (1) 1.6 (1) <0.001 29
Chronic diseases (%)
  Diabetes 27 22 <0.001 0
  Neuropathy 5 4 0.2 0
  Peripheral vascular disease 27 22 <0.001 0
  Amputation 0.1 0 0.7 0
  Spinal cord injury 0.2 0.1 0.9 0
  Coronary artery disease 4 4 0.9 0
  Leukemia 1 1 0.5 0
  Stroke 1.5 15 0.4 0
  Heart failure 27 25 0.03 0
  Anemia 18 14 <0.001 0