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Waist circumference to height ratio predicts inflammatory risk in children.

BACKGROUND: The increase in obesity, especially the increase of visceral fat, has been directly associated with health risk. Additionally, a waist-to-height ratio (WHtR) (0.5) has been proposed as an indicator of early health risk.

AIMS: To test the association between anthropometric measurements and inflammatory mRNA expression and to evaluate the effectiveness of WHtR to predict inflammatory risk in children.

SUBJECTS AND METHODS: Anthropometric measurements and fasting blood samples were collected in 94 Brazilian children (46 boys) aged 9-11 years. Children were identified as being at inflammatory risk based on cytokine mRNA expression levels at and above the 75th percentile. Inflammatory cytokine mRNA expression levels were determined through buff-coat using real-time polymerase chain reaction.

RESULTS: Body mass index (BMI), waist circumference (WC) and WHtR showed moderate-to-strong association with inflammatory cytokine mRNA gene expression. WHtR = 0.51 was the most accurate cut-off point in distinguishing children at inflammatory risk. Compared with children with WHtR <0.51, children with a WHtR ≥0.51 presented an odds ratio of 2.643 (95% CI = 1.749-3.994) for both diagnosed IL-6 and MCP-1 above the 75th percentile and 2.796 (95% CI = 1.802-4.338) for TNF-α above the 75th percentile. WHtR = 0.50 presented the same values of sensitivity and odds ratio and ∼7% lower specificity compared to WHtR = 0.51.

CONCLUSION: Anthropometric measurements have shown a moderate-to-strong association with the mRNA expression of inflammatory genes and a WHtR of 0.5 could serve as a cut-off point, suggesting increased risk of inflammatory responses.

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