Skip to main content

Table 4 Factors associated with the occurrence of pressure injuries (univariate logistic regression)

From: Extended prone positioning duration for COVID-19-related ARDS: benefits and detriments

Variables Patients without pressure injury (n = 60)
n/N (%) or med (Q1–Q3)
Patients with at least one pressure injury (n = 21)
n/N (%) or med (Q1–Q3)
OR (95% CI) p
Sex, male 40/60 (67) 18/21 (86) 3.00 (0.88–13.88) 0.081
Age, years 60 (51–68) 58 (52–63) 1.00 (0.96–1.05) 0.91
BMI, kg/m2 30 (27–37) 33 (29–36) 0.99 (0.94–1.01) 0.54
Type 2 diabetes 13/60 (22) 7/21 (33) 1.43 (0.50–3.88) 0.49
History of cardiovascular disease* 7/60 (12) 1/21 (5) 0.38 (0.02–2.32) 0.33
History of respiratory disease** 6/60 (10) 2/21 (10) 0.95 (0.13–4.53) 0.95
SAPS II score 36 (30–48) 39 (33–42) 0.99 (0.95–1.02) 0.43
PaO2/FiO2 ratio before first pronation session, mmHg 82 (68–114) 88 (75–99) 1.00 (0.98–1.01) 0.65
ECMO 12/60 (20) 5/21 (24) 1.25 (0.35–3.96) 0.71
Nitric oxide 25/60 (42) 9/21 (43) 1.05 (0.38–2.86) 0.92
At least one proning session with catecholamines 28/60 (47) 9/21 (43) 0.86 (0.31–2.33) 0.76
Duration of mechanical ventilation, days 14 (9–25) 29 (22–34) 1.01 (1.00–1.02) 0.12
ICU length of stay, days 17 (11–26) 29 (19–34) 1.05 (1.01–1.10) 0.021
Median duration of each proning sessions, h 40 (35–43) 36 (32–40) 0.96 (0.89–1.03) 0.26
Cumulated duration of all proning sessions, days*** 3 (2–5) 6 (4–8) 1.33 (1.11–1.63) 0.0015
  1. BMI, Body Mass Index; SAPS II, simplified acute physiology score; ECMO, Extracorporeal Membrane Oxygenation; PaO2, partial pressure of dioxide in arterial blood; FiO2, fraction of inspired oxygen; ICU, intensive care unit; PP, prone positioning
  2. ***This duration is the added duration of all PP sessions for each patient *chronic heart failure, ischemic heart disease or peripheral arterial disease; **chronic obstructive pulmonary disease or Asthma
  3. Bold formatting of p value indicates a statistically significant value