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. 2003 Jan;56(1):17–25. doi: 10.1136/jcp.56.1.17

Table 1.

WHO classification of weight and the risk of co-morbidities according to BMI values (BMI=weight in kg/height2 in metres)

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.