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The prevalence and validity of high, biologically implausible values of weight, height and BMI among 8.8 million children
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Mar 17 2016
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Source: Obesity (Silver Spring). 24(5):1132-1139
[PDF-223.61 KB]
Details:
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Alternative Title:Obesity (Silver Spring)
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Description:Objective
We assessed the prevalence and consistency of high values of weight, height and BMI considered to be biologically implausible (BIV) using cut-points cut points proposed by WHO among 8.8 million low-income children (13.7 million observations).
Methods
We performed cross-sectional and longitudinal analyses among 2- to 4-year-olds who were examined from 2008 through 2011.
Results
2.7% of the body size measurements were classified as biologically implausible; 95% of these BIVs were very high. Among the subset of children (3.6 million) examined more than once, most of those who initially had a high weight or BMI BIV also had a high BIV at the 2nd examination; odds ratios were >250. Based on several alternative classifications of BIVs, the current cut-points likely underestimate the prevalence of obesity by about 1%.
Conclusions
Many of the extremely high values of body size currently flagged as BIVs are unlikely to be errors. Increasing the z-score cut-points, or using a percentage of the maximum values in the National Health and Nutrition Examination Survey, could improve the balance between removing probable errors and retaining those that are likely correct.
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Pubmed ID:26991694
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Pubmed Central ID:PMC4846478
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