Team to Address Bariatric Care in Canadian Children

Team to Address Bariatric Care in Canadian Children

BMI z-Scores for Severe Obesity

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Growing-Up-Hurts-What-You-Need-to-Know-About-Growing-PainsA recent study adds to the growing body of evidence about the concerns of using BMI z-scores among children with severe obesity.

The authors used longitudinal data from 6994 children in the Bogalusa Heart Study who were examined multiple times to compare tracking of three BMI metrics: BMI-for sex/age zscore, BMI expressed as a percentage of the 95th percentile, and levels of BMI z-score that adjust for the compression of very high z-scores.

The study revealed that among the 247 children with severe obesity, the correlation of BMI z-scores traced less strongly (r = 0.46) than did metrics that expressed BMI relative to the 95th percentile or were based on zscores that did not have an upper bound (r = ∼0.6). Thus, rather than using BMI z-scores, it would be preferable to express very high BMIs relative to the Centers for Disease Control and Prevention (CDC) 95th percentile.

Freedman et al., Pediatrics, 2017
Check out our other posts on BMI z-scores HERE, HERE, and HERE.

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