OBJECTIVES: Accurate determination of ideal body weight (IBW) in pediatric patients is important for the proper dosing of many medications and the classification of nutritional status. There is no consensus on the best method to calculate IBW. The purpose of this study is to evaluate and compare 7 different methods used to calculate IBW in the pediatric population. METHODS: This was a retrospective observational study. All subjects were pediatric inpatients at a 536-bed community teaching hospital between January 1, 2016, and June 30, 2017. Subjects were divided into 2 cohorts: cohort 1 was aged 12 months and 0 day to 35 months and 30 days, and cohort 2 was aged 36 months and 0 day to 17 years and 364 days. The McLaren method was used as the reference to compare with 6 other methods: Moore method, Devine method, American Dietetic Association (ADA) method, body mass index (BMI) method, Traub equation, and simplified Traub equation. RESULTS: For cohort 1 (n = 347), the Moore method was not statistically different from the McLaren method with a mean difference of -0.07 kg (95% CI: -0.14 to 0.01, p = 0.07). For cohort 2 (n = 1095), the BMI method was not statistically different from the McLaren method with a mean difference of 0.17 kg (95% CI: -0.07 to 0.40, p = 0.17). CONCLUSIONS: In both cohorts, the majority of methods used to calculate IBW in pediatric patients leads to statistically different results when compared with the McLaren method. For certain methods, these differences become pronounced at high and low height percentiles and in older age groups. Copyright Published by the Pediatric Pharmacy Advocacy Group. All rights reserved. For permissions, email: matthew.helms@ppag.org 2019.
OBJECTIVES: Accurate determination of ideal body weight (IBW) in pediatric patients is important for the proper dosing of many medications and the classification of nutritional status. There is no consensus on the best method to calculate IBW. The purpose of this study is to evaluate and compare 7 different methods used to calculate IBW in the pediatric population. METHODS: This was a retrospective observational study. All subjects were pediatric inpatients at a 536-bed community teaching hospital between January 1, 2016, and June 30, 2017. Subjects were divided into 2 cohorts: cohort 1 was aged 12 months and 0 day to 35 months and 30 days, and cohort 2 was aged 36 months and 0 day to 17 years and 364 days. The McLaren method was used as the reference to compare with 6 other methods: Moore method, Devine method, American Dietetic Association (ADA) method, body mass index (BMI) method, Traub equation, and simplified Traub equation. RESULTS: For cohort 1 (n = 347), the Moore method was not statistically different from the McLaren method with a mean difference of -0.07 kg (95% CI: -0.14 to 0.01, p = 0.07). For cohort 2 (n = 1095), the BMI method was not statistically different from the McLaren method with a mean difference of 0.17 kg (95% CI: -0.07 to 0.40, p = 0.17). CONCLUSIONS: In both cohorts, the majority of methods used to calculate IBW in pediatric patients leads to statistically different results when compared with the McLaren method. For certain methods, these differences become pronounced at high and low height percentiles and in older age groups. Copyright Published by the Pediatric Pharmacy Advocacy Group. All rights reserved. For permissions, email: matthew.helms@ppag.org 2019.
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