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Table 1 Patient characteristics

From: Effect of prone positioning on oxygenation and static respiratory system compliance in COVID-19 ARDS vs. non-COVID ARDS

Variables COVID-19 ARDS Non-COVID ARDS
Entire group N = 23 Entire group N = 145 P valuea PaO2/FiO2-matched N = 23 P valuea Compliance-matched N = 23 P valuea
Age, years 70 (63–74) 67 (59–74) 0.222 75 (70–79) 0.092 66 (60–74) 0.159
Male sex 15 (65.2%) 97 (66.9%) 0.874 17 (73.9%) 0.522 16 (69.6%) 0.753
Height, cm 165 ± 9 163 ± 8 0.374 163 ± 10 0.614 164 ± 8 0.791
Body weight, kg 70 (58–79) 61 (53–70) 0.018 57 (51–69) 0.015 64 (55–69) 0.132
Body mass index, kg/m2 25.6 (22.9–27.4) 22.9 (20.8–26.0) 0.024 22.5 (19.3–24.7) 0.009 22.7 (20.5–27.2) 0.121
Interval between intubation and the first prone positioning session, days 1 (0–2) 2 (1–5) 0.009 1 (0–3) 0.116 2 (1–4) 0.047
Total number of sessions of prone positioning 4 (3–9) 2 (1–4) < 0.001 2 (1–4) 0.008 2 (1–4) 0.011
Mean duration of prone positioning per session, hours 18 (17–19) 18 (16–19) 0.653 17 (16–18) 0.180 17 (16–20) 0.231
Charlson comorbidity index 4 (3–4) 5 (3–8) 0.012 5 (4–6) 0.011 5 (4–7) 0.032
APACHE II score 20 (12–25) 29 (25–33) < 0.001 30 (26–35) < 0.001 29 (25–37) < 0.001
SAPS II score 42 (31–61) 65 (55–71) < 0.001 66 (62–78) < 0.001 65 (58–78) < 0.001
SOFA score 8 (5–11) 12 (9–14) < 0.001 12 (9–14) 0.002 13 (11–15) < 0.001
  1. APACHE acute physiology and chronic health evaluation, ARDS acute respiratory distress syndrome, SAPS Simplified Acute Physiology Score, SOFA sequential organ failure assessment
  2. aP values are for comparison between patients with COVID-19 ARDS and patients with non-COVID ARDS