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Preoperative body composition characteristics
| n | 698 |
| Mean FMI | 9.1 (SD 2.2) |
| Non-obese (FMI ≤9 kg/m2) | 354 (50.7%) |
| Obese (FMI >9 kg/m2) | 344 (49.3%) |
| Class 1 obesity (FMI >9–12 kg/m2) | 273 (39.1%) |
| Class 2 obesity (FMI >12–15 kg/m2) | 63 (9.0%) |
| Class 3 obesity (FMI >15 kg/m2) | 8 (1.1%) |
FMI: fat mass index; SD: standard deviation.
