Table 1.
WHO classification | BMI (Kg/m2) | Risk of co-morbidities |
Underweight | <18.5 | Low (but risk of other clinical problems increased) |
Normal weight | 18.5–24.9 | Average |
Overweight | 25.0–29.9 | Mildly increased |
Obese | ≥30.0 | |
Class I | 30.0–34.9 | Moderate |
Class II | 35.0–39.9 | Severe |
Class III | ≥40.0 | Very severe |
BMI, body mass index; WHO, World Health Organisation.