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Table 1 Baseline and clinical characteristics of the study population

From: Twenty-four-hour mechanical power variation rate is associated with mortality among critically ill patients with acute respiratory failure: a retrospective cohort study

Variables Total
(n = 602)
MP variation rate ≤ 0%
(MP-worsened, n = 173)
MP variation rate > 0%
(MP-improved, n = 429)
p
Age, years 61 (50, 70) 62 (50, 70) 61 (50, 69) 0.500
Female, n (%) 155 (26) 33 (19) 122 (28) 0.023
Height, cm 170 (165, 175) 172 (165, 175) 170 (163, 175) 0.022
Weight, kg 74 (65, 80) 75 (67, 85) 70 (63, 80) 0.003
Admission type, n (%)     0.425
 Medical 251 (42) 77 (45) 174 (41)  
 Surgical 351 (58) 96 (55) 255 (59)  
APACHE II score 20 (15, 26) 21 (16, 28) 20 (15, 25) 0.076
SOFA score 10 (5, 13) 10 (5, 14) 10 (6, 13) 0.608
Norepinephrine dose, µg/kg/min 0.26 (0.10, 0.56) 0.27 (0.11, 0.60) 0.24 (0.10, 0.53) 0.368
Respiratory treatment     
 Prone positioning, n (%) 178 (30) 68 (39) 110 (26) 0.001
 NMBA, n (%) 54 (9) 28 (16) 26 (6) < 0.001
Ventilation mode     0.231
 Volume control, n (%) 549 (91) 154 (89) 395 (92)  
 Pressure control, n (%) 53 (9) 19 (11) 34 (8)  
Baseline MP, J/min 12.1 (10.8, 14.1) 11.7 (10.8, 13.8) 12.2 (10.9, 14.3) 0.088
24-h MP, J/min 10.7 (8.9, 13.3) 14.2 (12.4, 16.4) 9.7 (8.4, 11.3) < 0.001
MP variation rate, % 14 (− 3, 27) − 14 (− 26, − 6) 21 (12, 31) < 0.001
ICU length of stay, days 9 (5, 15) 9 (5, 15) 9 (5, 15) 0.731
Hospital length of stay, days 15 (10, 27) 13 (9, 29) 16 (10, 27) 0.065
VFD at day 28, days 16 (0, 22) 10 (0, 21) 16 (0, 22) 0.007
ICU mortality, n (%) 166 (28) 62 (36) 104 (24) 0.005
  1. Data are presented as median (IQR) unless otherwise specified
  2. APACHE, Acute Physiology and Chronic Health Evaluation; SOFA, Sequential Organ Failure Assessment; NMBA, neuromuscular blocking agent; MP, mechanical power; ICU, intensive care unit; VFD, ventilator-free day