Table 1

World Health Organisation classification scheme for overweight and obesity by the body mass index with associated disease risk3

ClassificationObesity classBody mass index (kg/m2)
Underweight<18.5
Normal18.5–24.9
Overweight25.0–29.9
ObesityI30.0–34.9
II35.0–39.9
Extreme obesityIII≥40