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Evaluation of Different Methods Used to Calculate Ideal Body Weight in the Pediatric Population

Kai Kang, Randy Absher, Elizabeth Farrington

    The Journal of Pediatric Pharmacology and Therapeutics : JPPT : the Official Journal of PPAG
    |October 11, 2019
    PubMed

    Insights

    Determining ideal body weight (IBW) in children is crucial for medication dosing and nutritional assessment. This study found that most IBW calculation methods yield significantly different results in pediatric patients compared to the McLaren method, especially in older children.

    Area of Science:

    • Pediatric Medicine
    • Clinical Nutrition
    • Pharmacokinetics

    Background:

    • Accurate ideal body weight (IBW) determination is critical for pediatric medication dosing and nutritional status assessment.
    • No established consensus exists for the optimal IBW calculation method in pediatric populations.
    • This study addresses the need for comparative analysis of various IBW calculation methods in children.

    Purpose of the Study:

    • To evaluate and compare seven distinct methods for calculating ideal body weight (IBW) in pediatric patients.
    • To identify the most accurate and reliable IBW calculation methods for different pediatric age groups.
    • To inform clinical practice regarding the selection of appropriate IBW calculation formulas for children.

    Main Methods:

    • Retrospective observational study of pediatric inpatients (January 2016 - June 2017).
    • Subjects divided into two cohorts: 12 months to 35 months and 36 months to 17 years.
    • Compared six methods (Moore, Devine, ADA, BMI, Traub, simplified Traub) against the McLaren method as reference.

    Main Results:

    • In younger children (cohort 1), the Moore method showed no statistically significant difference from the McLaren method (mean difference -0.07 kg).
    • In older children (cohort 2), the body mass index (BMI) method showed no statistically significant difference from the McLaren method (mean difference 0.17 kg).
    • Most other methods produced statistically significant differences in IBW calculations compared to the McLaren method across both cohorts.

    Conclusions:

    • The majority of commonly used IBW calculation methods yield statistically different results in pediatric patients compared to the McLaren method.
    • Method-dependent discrepancies in IBW calculations can be particularly pronounced in children at extreme height percentiles and in older age groups.
    • Findings suggest a need for careful consideration and potential standardization of IBW calculation methods in pediatric clinical practice.
    Abstract

    Keywords:
    dosingideal body weightpediatrics

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