Comparison of complications over the course of mechanical ventilation in each body mass index groups
| Underweight (BMI <18.5 kg/m2) | Normal (BMI 18.5–24.9 kg/m2) | Overweight (BMI 25–29.9 kg/m2) | Obese (BMI 30–39.9 kg/m2) | Severely obese (BMI >40 kg/m2) | p-Value | |
| N (% (95% CI)) | 184 (3.7% (3.2 to 4.3)) | 1995 (40.1% (38.8 to 41.5)) | 1781 (35.8% (34.5 to 37.2)) | 792 (15.9%; (14.9 to 16.9)) | 216 (4.3%; (3.8 to 4.9)) | |
| Barotrauma, N (% (95% CI)) | 8 (4.3% (1.9 to 8.4)) | 63 (3.1% (2.4 to 4.0)) | 54 (3.0% (2.3 to 3.9)) | 27 (3.4% (2.2 to 4.9)) | 5 (2.3% (0.7 to 5.3)) | 0.807 |
| Ventilator associated pneumonia, N (% (95% CI)) | 9 (4.9% (2.3 to 9.1)) | 68 (3.4% (2.6 to 4.3)) | 72 (4.0% (3.2 to 5.1)) | 36 (4.5% (3.2 to 6.2)) | 12 (5.5% (2.9 to 9.5)) | 0.380 |
| Sepsis, N (% (95% CI)) | 22 (11.9% (7.6 to 19.5)) | 158 (7.9% (6.7 to 9.2)) | 155 (8.7% (7.4 to 10.1)) | 50 (6.3% (4.7 to 8.2)) | 15 (6.9% (3.9 to 11.1)) | 0.076 |
| Cardiovascular failure, N (% (95% CI)) | 60 (32.6% (25.9 to 39.9)) | 620 (31.1% (29.0 to 33.1)) | 587 (32.9% (30.8 to 35.2)) | 224 (28.3% (25.1 to 31.5)) | 63 (29.2% (23.2 to 35.7)) | 0.179 |
| Respiratory failure, N (% (95% CI)) | ||||||
| With criteria of acute respiratory distress syndrome | 11 (5.9% (3.0 to 10.4)) | 89 (4.5% (3.6 to 5.5)) | 102 (5.7% (4.7 to 6.9)) | 55 (6.9% (5.3 to 8.9)) | 19 (8.8% (5.4 to 13.4)) | 0.021 |
| Without criteria of acute respiratory distress syndrome | 42 (22.8% (16.9 to 29.6)) | 556 (27.9% (25.9 to 29.9)) | 557 (31.3% (29.1 to 33.5)) | 256 (32.3% (29.1 to 35.7)) | 81 (37.5% (31.0 to 44.3)) | 0.002 |
| Acute renal failure, N (% (95% CI)) | 12 (6.5% (3.4 to 11.1)) | 123 (6.2% (5.1 to 7.3)) | 150 (8.4% (7.2 to 9.8)) | 71 (8.9% (7.1 to 11.2)) | 26 (12.0% (8.0 to 17.1)) | 0.003 |
| Hepatic failure, N (% (95% CI)) | 9 (4.9% (2.3 to 9.1)) | 100 (5.0% (4.1 to 6.1) | 83 (4.7 (3.7 to 5.7)) | 42 (5.3% (3.8 to 7.1)) | 18 (8.3% (5.0 to 12.8)) | 0.239 |
| Haematologic failure, N (% (95% CI)) | 21 (11.4% (7.2 to 16.9)) | 143 (7.2% (6.1 to 8.4)) | 127 (7.1% (5.9 to 8.4)) | 49 (6.2% (4.6 to 8.1)) | 14 (6.5% (3.6 to 10.6)) | 0.177 |