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Mechanistic models are utilized in individual analysis using single-source data, but imperfections arise due to data collection errors, preventing perfect prediction of observed data. The mathematical equation involves known values (Xi), observed concentrations (Ci), measurement errors (εi), model parameters (ϕj), and the related function (ƒi) for i number of values. Different least-squares metrics quantify differences between predicted and observed values. The ordinary least...
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Compartmentalization Index: Description and Applications in Anthropological Studies.

José M López-Rey1,2, Óscar Cambra-Moo2, Daniel García-Martínez2,3,4,5

  • 1Paleoanthropology Group, Department of Paleobiology, National Museum of Natural Sciences (MNCN-CSIC), Madrid, Spain.

American Journal of Biological Anthropology
|June 28, 2025
PubMed
Summary
This summary is machine-generated.

The compartmentalization index enhances visualization of mineralized tissue variations in growing individuals. This non-linear index is effective for analyzing subtle bone growth differences, even in adult bone research.

Keywords:
compartmentalization indexcross sectionfemurmineralized areaontogeny

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Area of Science:

  • Paleoanthropology
  • Bioarchaeology
  • Human Osteology

Background:

  • Linear methods offer limited insight into mineralized tissue variations in non-adult bones due to high mineralized area.
  • The compartmentalization index, a non-linear metric, can overcome these limitations by amplifying differences in highly mineralized cross-sections.

Purpose of the Study:

  • To evaluate the utility of the compartmentalization index for analyzing mineralized tissue variations in non-adult Homo sapiens femur diaphyses.
  • To compare the effectiveness of the compartmentalization index with direct percentage measurements.

Main Methods:

  • Five femur diaphyseal cross-sections were analyzed from 35 non-adult Homo sapiens (perinatal to 5 years old).
  • The percentage of mineralized area and the compartmentalization index were calculated for each section.
  • Graphical testing was used to analyze the distribution of both measurements.

Main Results:

  • The compartmentalization index visually magnified variations in femur diaphyseal mineralized areas exceeding 90%.
  • Statistical comparisons between groups were not affected by the index's use.
  • Data distributions for the index and direct percentage measurements were comparable for lower mineralized areas.

Conclusions:

  • The compartmentalization index is valuable for detecting subtle variations during early growth and development in human bone.
  • Both the compartmentalization index and direct percentage measurements are equally effective for bone sections with lower mineralized areas.
  • The compartmentalization index is applicable to research on adult individuals as well.