ABC | Volume 114, Nº3, March 2020

Original Article Santos et al. Waist circumference of children in Brazil Arq Bras Cardiol. 2020; 114(3):530-537 Figure 1 – WC percentile curves for Brazilian children (aged 6–10 years). Boys (A) Girls (B). 5th 10th 15th 25th 50th 80th 90th 75th 85th 5th 10th 15th 25th 50th 80th 90th 75th 85th 6 7 8 9 10 95 85 75 65 55 45 (cm) 95 85 75 65 55 45 (cm) Age (years old) 6 7 8 9 10 Age (years old) Abdominal circumference percentile curves - Boys (A) Abdominal circumference percentile curves - Girls (B) Table 2 – Distribution of WC percentiles and cut-off points for obesity according to age and gender in the population studied Cut-off values (cm) for obesity WC percentiles Boys Age (y) 5th 10th 15th 25th 50th 75th 85th 90th 95th 6 61.2 50.5 52.0 53.0 54.0 57.0 61.0 66.0 69.0 75.8 7 63.2 51.0 52.0 53.0 55.0 58.0 64.0 69.0 73.0 78.0 8 64.8 52.0 54.0 55.0 56.0 60.0 66.0 71.0 75.0 80.0 9 67.7 53.0 55.0 56.0 58.0 62.0 68.0 75.0 80.0 85.0 10 70.5 55.0 57.0 58.0 60.0 64.0 72.0 79.0 83.0 89.0 Girls Age (y) 6 62.7 50.0 51.0 52.0 54.0 57.0 62.5 67.0 70.0 76.0 7 64.2 50.0 52.0 53.0 54.0 58.0 63.0 68.0 71.7 77.0 8 64.7 51.0 53.0 54.0 55.2 59.0 66.0 72.0 75.0 80.0 9 69.7 52.0 54.0 55.0 57.0 62.0 70.0 74.5 78.0 82.0 10 72.7 54.5 56.0 57.0 59.0 64.8 73.0 78.0 82.0 87.0 y: years old. Table 3 – Application of the obesity waist cut-off values in the study population classified by BMI as non-obese and obese, according to age and gender Non-obese children (%) Obese children (%) Boys Age (y) ≤ Cut-off * > Cut-off * ≤ Cut-off * > Cut-off * 6 92.9 7.1 11.0 89.0 7 95.7 4.2 8.4 91.6 8 94.1 5.9 9.1 90.9 9 96.7 3.3 12.6 87.4 10 94.2 5.8 10.6 89.4 Girls Age (y) 6 93.1 6.9 9.9 90.1 7 95.4 4.6 4.7 95.3 8 91.5 8.5 4.9 95.1 9 95.8 4.2 11.8 88.2 10 94.6 5.4 12.1 87.9 y: years old; *: pre-determined cut-off WC value for each age and gender. 533