| BMI (kg/m2) | Classification | Comorbidity risk |
| 18.5 - 24.9 | Normal | Medium |
| 25.0 - 29.9 | Pre-obese | Moderate |
| 30.0 - 34.9 | Obesity level I | Increased |
| 35.0 - 39.9 | Obesity level II | Severe |
| ≥40.0 | Obesity level III (morbid) | Very severe |