Comparison of outcomes 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)) | |
| Days of mechanical ventilation, median (IQR) | 4 (2, 8) | 4 (2, 8) | 4 (2, 8) | 4 (2, 8) | 4 (2, 8) | 0.159 |
| Days of weaning, median (IQR) | 1 (1, 3) | 1 (1, 2) | 1 (1, 2) | 1 (1, 2) | 2 (1, 3) | 0.292 |
| Length of stay in the intensive care unit, median (IQR) | 8 (4, 16) | 8 (4, 15) | 8 (4, 14) | 8 (5, 15) | 8 (5, 15) | 0.369 |
| Mortality in the intensive care unit, N (% (95% CI)) | 60 (32.6% (25.9 to 35.9)) | 630 (31.6% (29.5 to 33.7)) | 558 (31.3% (29.2 to 33.5)) | 227 (28.6% (25.5 to 31.9)) | 58 (26.8% (21.1 to 33.3)) | 0.360 |
| Length of stay in the Hospital, median (IQR) | 18 (10, 36) | 17 (9, 31) | 17 (9, 31) | 17 (10, 31) | 17 (9, 28) | 0.619 |
| Mortality in the Hospital, N (% (95% CI)) | 71 (38.6% (31.5 to 46.0)) | 708 (35.5% (33.4 to 37.6)) | 655 (36.8% (34.5 to 39.1)) | 263 (33.2% (29.9 to 36.6)) | 63 (29.2% (23.2 to 35.7)) | 0.141 |