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Table 1 World Health Organization classification of obesity [20]

From: A review on the anesthetic management of obese patients undergoing surgery

Body mass index (kg.m2) Classification
< 18.5 Underweight
18.5 – 24.9 Normal
25.0 – 29.9 Overweight
30.0 – 34.9 Obese Class 1
35.0 – 39.9 Obesity Class 2
> 40.0 Obese Class 3 (previously ‘morbid obesity’)