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Child factor in measurement dependability

M Lampl1, L Birch, M F Picciano

  • 1Department of Anthropology, Emory University, Atlanta, Georgia 30322, USA. mlampl@emory.edu

American Journal of Human Biology : the Official Journal of the Human Biology Council
|June 16, 2001
PubMed

Insights

Child physiology and cooperation significantly impact infant length measurements, accounting for 60-70% of total error. Longitudinal growth studies must account for this substantial "child factor" in measurement reliability.

Area of Science:

  • Pediatric growth research
  • Biomedical measurement science
  • Child development studies

Background:

  • Accurate measurement is crucial for longitudinal growth studies.
  • Previous research focused on technical measurement error.
  • Errors related to child physiology and cooperation were understudied.

Purpose of the Study:

  • To quantify measurement errors stemming from child physiology and cooperation.
  • To assess the impact of the "child factor" on recumbent length measurement reliability.
  • To inform analytical methods for serial growth data.

Main Methods:

  • Analysis of 925 recumbent length measurement replicates.
  • Measurements were taken during infant growth stasis intervals.
  • Quantification of total measurement error variance.

Main Results:

  • The "child factor" accounts for 60-70% of total measurement unreliability.
  • Significant individual differences were observed in measurement error.
  • Recommended estimate for total unreliability is 2-3 times the technical error of measurement.

Conclusions:

  • Child-related factors are the primary source of unreliability in infant recumbent length measurements.
  • Current analytical methods for longitudinal growth data may need revision.
  • Future studies should incorporate the "child factor" for more accurate growth assessments.

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