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Prevalence rates (%) of thinness among 6–9-year-old schoolchildren in Serbia (n 4861), September–November 2015. Thinness grades are defined as International Obesity Task Force gender- and age-specific cut-offs for BMI (calculated as weight in kilograms divided by the square of height in metres) to pass through BMI of 18·5 kg/m2 (grade I or mild thinness; 
), 17·0 kg/m2 (grade II or moderate thinness; 
) and 16·0 kg/m2 (grade III or severe thinness; 
) at age 18 years (G, girls; B, boys)
