2.2. Inclusion criteria

The inclusion criteria were (1) studies reporting a population-based prevalence of OW or OB according to the BMI calculated as weight in kg divided by height in m², and cut-offs proposed by the IOTF (27, 28) (the IOTF referent cut-off points and specific IOTF cut-off points), BMI for OW boys aged from 6 to 14 years is (17.55 to 22.62), and for girls (17.34 to 23.34) (27). And specific IOTF cut-off points, BMI for OW boys aged from 6 to 14 years is (17.52 to 22.60), and for girls (17.33 to 23.27) (28). BMI for OB boys aged from 6 to 14 years is (19.78 to 27.63), and for girls (19.65 to 28.57) (27). And specific IOTF cut-off points, BMI for OB boys aged from 6 to 14 years is (19.76 to 27.64), and for girls (19.62 to 28.42) (28). For detailed results see in (27, 28). Six studies had the same referent cut-off points but with different names; (2) cross-sectional studies with weight and height measured by trained personnel; and (3) studies including populations aged six to 14.