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Table 1 WHO international classification of adult overweight and obesity according to body mass index (BMI)[5]

From: Designing intelligent anesthesia for a changing patient demographic: a consensus statement to provide guidance for specialist and non-specialist anesthetists written by members of and endorsed by the Society for Obesity and Bariatric Anaesthesia (SOBA)

Classification BMI (kg/m2)
Normal range 18.5–25
Overweight ≥25
 Pre-obese 25–30
Obese ≥30
 Obese class I 30–35
 Obese class II 35–40
 Obese class III (morbidly obese) ≥40