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Validation and human factor analysis study of an infant weight estimation device.

Susan M Abdel-Rahman1,2, Ian M Paul3, Paula Delmore4

  • 1Children's Mercy, University of Missouri Kansas City-School of Medicine, Kansas City, MO, USA. srahman@cmh.edu.

BMC Pediatrics
|January 24, 2020
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Summary

A new infant weight estimation device, using head and chest circumference, accurately predicts infant weight when scales are unavailable. Human factors testing shows the device is easy to use and reliable for medical settings.

Keywords:
Chest circumferenceFull-termHead circumferencePreterm

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Area of Science:

  • Medical device development
  • Pediatric medicine
  • Human factors engineering

Background:

  • Accurate infant weight measurement is crucial for medical management but scales are not always accessible.
  • A validated method using chest circumference (CC) and head circumference (HC) for infant weight estimation was previously developed.
  • This study evaluated a device implementing this method for its human factors (HF) and predictive accuracy.

Purpose of the Study:

  • To assess the human factors experience with a novel infant weight estimation device.
  • To determine the predictive performance of the device in estimating infant weight.
  • To validate the device's utility in clinical settings where traditional scales are impractical.

Main Methods:

  • A prospective, multi-center, observational, masked study involving 486 infants (0-90 days).
  • Fifteen raters used both calibrated scales and masked versions of the device for infant measurements.
  • Human factors aspects, including task evaluation and rater confidence, were assessed alongside predictive performance metrics (Mean Error, Mean Percentage Error).

Main Results:

  • The device demonstrated high correlation with actual infant weight (r=0.97).
  • Predicted weights were within 10% (86%) and 15% (99%) of actual weights, with low Mean Error (-69 ± 257g) and Mean Percentage Error (-1.3 ± 6.9%).
  • Human factors errors were minimal (0.1-0.8%), and raters reported high confidence in device use.

Conclusions:

  • The infant weight estimation device is statistically equivalent to the established method and provides weight approximations within acceptable variance.
  • Human factors data indicate the device is user-friendly and suitable for clinical application.
  • This device offers a practical solution for estimating infant weight when calibrated scales are unavailable or inconvenient.