Barlow SE, Salahuddin M, Durand C, Pont SJ, Hoelscher DM, Butte NF.What is the best measure of adiposity change in growing children: BMI, BMI%, BMI z-score or BMI centile? European Journal of Clinical Nutrition 2005 59:419–25. Cole TJ, Faith MS, Pietrobelli A, Heo M.These metrics can be adjusted for differences by sex and age by specifying the ‘all=TRUE’ option in the R program. Because the dispersion of BMI values is much greater at age 18 y than at age 2 y, it is possible that a bmip50 value of 150, for example, should be interpreted differently at these two ages. Note that some care should be taken in using these metrics as it is likely that their interpretations differ by age. If desired, 100 can be subtracted from bmip50 so that it is the %distance from the median (9). (2) bmip50: BMI expressed as a percentage of the 50th percentile (median) of the CDC growth charts. (1) bmip95: BMI expressed as a percentage of the 95th percentile of the CDC growth charts. Further, a recent commentary (8) suggested that until consensus is reached, “investigators can consider consistently reporting more metrics (e.g., absolute and percentage of change in BMI, change in percentage of the 95th BMI percentile, change in percentage of the median).”Īs of December 15, 2022, the SAS program includes 2 additional variables for assessing BMI change: This is because of the curvilinear relation of BMI to BMIz, but would likely apply to both the original and extended (7) versions of BMIz. Several studies (1–6) have shown that expressing BMI relative to the CDC 50th or 95th percentile is better than the LMS-based version of BMIz in assessing changes in adiposity. Although extended bmiz should work well in most analyses, the best metric for assessing BMI change is uncertain.
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