Association between body mass index, triponderal mass index, and body fat percentage in children and adolescents
DOI:
https://doi.org/10.47197/retos.v72.116843Keywords:
Adolescents , anthropometry, body composition, children, nutritional statusAbstract
Introduction: Despite its widespread use, the body mass index (BMI) still has limitations for assessing adiposity in pediatric populations, particularly due to its inability to differentiate between fat mass and muscle mass.
Objective: To examine the association between BMI, triponderal mass index (TMI), and body fat percentage (%BF) in a representative sample of children and adolescents.
Methodology: This cross-sectional study included 824 students (females n=370, males n=454) from public schools in Quintero, Chile. Participants were stratified by age: children aged 6-9 years (n=355) and adolescents aged 10-19 years (n=469). Weight and height were measured to calculate BMI-z scores, TMI (weight/height³), and %BF (Slaughter formula). Data are presented as mean and standard deviation. Pearson's correlation coefficient (r) assessed associations, while the coefficient of determination (R²) quantified effect sizes.
Results: High prevalence of overweight was observed: 51.5% in children (6-9 years) and 59.8% in adolescents (10-19 years). Significant correlations (p<0.01) were found between indices and %BF: in children, BMI showed r=0.792 with %BF and TMI showed r=0.728; in adolescents, correlations were r=0.728 for BMI and r=0.739 for TMI. TMI demonstrated greater explanatory power (R²) for %BF in girls (R²=0.571) and male adolescents (R²=0.534), while BMI was a better predictor in boys (R²=0.747) and female adolescents (R²=0.623).
Conclusions: TMI showed stronger association with %BF in girls and male adolescents, while BMI was more accurate in boys and female adolescents. These findings highlight the need to establish standardized cut-off points for TMI in pediatric populations.
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