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Table 1 Comparison of baseline characteristics in patients with extubation success and failure

From: Application of bedside ultrasound in predicting the outcome of weaning from mechanical ventilation in elderly patients

Variable Extubation success (n = 69) Extubation failure (n = 32) p value
Age, years (IQR) 70 (65–87) 68 (66–89) 0.760
Male sex (%) 35 (74.5) 7 (53.8) 0.181
Body mass index, kg/m2 (IQR) 21.4 (19.0–24.9) 22.3 (20.2–23.5) 0.859
Simplified acute physiology score III (IQR) 71 (63–77) 59 (51–81) 0.190
APACHE II 14.5 (10–22) 15.2 (11–24) 0.18
SOFA score (x ± s) on admission 4.75 ± 2.14 5.13 ± 2.25 0.188
SOFA score (x ± s) on SBT 3.84 ± 1.24 4.25 ± 1.65 0.158
Clinical frailty score 5.11 ± 1.8 5.23 ± 1.9 0.512
Primary disease    
 Pulmonary infection (N, %) 28 (40.58) 10 (31.25) 0.625
 AECOPD (N, %) 7 (10.1) 4 (12.5) 0.246
 Acute left heart failure (N, %) 3 (4.3) 1 (3.1) 0.346
 Intracranial lesions (N, %) 10 (14.5) 6 (18.75) 0.324
Complication    
 Respiratory failure (N, %) 45 (65.2) 20 (62.5) 0.821
 ARDS (N, %) 6 (8.7) 2 (6.25) 0.111
 PaO2/FiO2 = 201–300 mmHg (mild ARDS) 2 (2.9) 0 (0) 0.50
 PaO2/FiO2 = 101–200 mmHg (moderate ARDS) 2 (2.9) 1 (3.1) 0.63
 PaO2/FiO2 ≤ 100 mmHg (severe ARDS) 2 (2.9) 1 (3.1) 0.63
 Shock (N %) 32 (46.38) 18 (56.25) 0.725
 Obstruction of sputum drainage (N, %) 24 (34.8) 12 (37.5) 0.526
 Total duration of mechanical ventilation in hospital (IQR) 6 (3–10) 10 (6–14) 0.001
 ICU stay time (IQR) 8 (5–16) 12 (6–21) 0.0001
 Total length of stay (d, x ± s) 19.73 ± 3.69 24.67 ± 4.12 0.068