@article{9462f5cb9beb44e892856ae9f3607daf,
title = "Measuring BMI change among children and adolescents",
abstract = "Background: Weight control programs for children monitor BMI changes using BMI z-scores that adjust BMI for the sex and age of the child. It is, however, uncertain if BMIz is the best metric for assessing BMI change. Objective: To identify which of 6 BMI metrics is optimal for assessing change. We considered a metric to be optimal if its short-term variability was consistent across the entire BMI distribution. Subjects: 285 643 2- to 17-year-olds with BMI measured 3 times over a 10- to 14-month period. Methods: We summarized each metric's variability using the within-child standard deviation. Results: Most metrics' initial or mean value correlated with short-term variability (|r| ~ 0.3 to 0.5). The metric for which the within-child variability was largely independent (r = 0.13) of the metric's initial or mean value was the percentage of the 50th expressed on a log scale. However, changes in this metric between the first and last visits were highly (r ≥ 0.97) correlated with changes in %95th and %50th. Conclusions: Log %50 was the metric for which the short-term variability was largely independent of a child's BMI. Changes in log %50th, %95th, and %50th are strongly correlated.",
keywords = "BMI, PEDSnet, children, metrics, obesity",
author = "Freedman, {David S.} and {Goodwin Davies}, {Amy J.} and Phan, {Thao Ly Tam} and Cole, {F. Sessions} and Nathan Pajor and Suchitra Rao and Ihuoma Eneli and Lyudmyla Kompaniyets and Lange, {Samantha J.} and Christakis, {Dimitri A.} and Forrest, {Christopher B.}",
note = "Funding Information: We thank Dr. Tim Cole for his helpful suggestions on an early draft of the manuscript. The research reported in this report was conducted using PEDSnet, A Paediatric Learning Health System, and includes data from the following PEDSnet institutions: Children's Hospital of Philadelphia; Cincinnati Children's Hospital Medical Center; Children's Hospital of Colorado; Nationwide Children's Hospital; Nemours Children's Health System (a Delaware and Florida health system); Seattle Children's Hospital; and St. Louis Children's Hospital/Washington University School of Medicine. This project was funded in part by a grant (Award Number RI-CRN-2020-007) from the Patient-Centered Outcomes Research Institute (PCORI). This award supports the core technical and governance infrastructure for PEDSnet. The Children's Hospital of Philadelphia Institutional Review Board determined this project is exempt under HHS regulation 45 CFR 46.101(b). CDC has determined that this project does not require IRB approval. The analyses used a de-identified dataset without personal health identifiers, and temporal information was limited to the year of birth and age in days. Funding Information: We thank Dr. Tim Cole for his helpful suggestions on an early draft of the manuscript. The research reported in this report was conducted using PEDSnet, A Paediatric Learning Health System, and includes data from the following PEDSnet institutions: Children's Hospital of Philadelphia; Cincinnati Children's Hospital Medical Center; Children's Hospital of Colorado; Nationwide Children's Hospital; Nemours Children's Health System (a Delaware and Florida health system); Seattle Children's Hospital; and St. Louis Children's Hospital/Washington University School of Medicine. This project was funded in part by a grant (Award Number RI‐CRN‐2020‐007) from the Patient‐Centered Outcomes Research Institute (PCORI). This award supports the core technical and governance infrastructure for PEDSnet. The Children's Hospital of Philadelphia Institutional Review Board determined this project is exempt under HHS regulation 45 CFR 46.101(b). CDC has determined that this project does not require IRB approval. The analyses used a de‐identified dataset without personal health identifiers, and temporal information was limited to the year of birth and age in days. Publisher Copyright: {\textcopyright} 2022 World Obesity Federation. This article has been contributed to by US Government employees and their work is in the public domain in the USA.",
year = "2022",
month = jun,
doi = "10.1111/ijpo.12889",
language = "English",
volume = "17",
journal = "Pediatric Obesity",
issn = "2047-6302",
number = "6",
}