Juvenile body mass estimation: A methodological evaluation.

Area of Science:

• Forensic Anthropology
• Bioarchaeology
• Human Osteology

Background:

• Existing body mass prediction formulae for immature skeletal remains include Ruff (2008) and Robbins et al. (2010).
• Both methods utilize the same reference population but differ in their selection of independent variables.
• Ruff (2008) employs metaphyseal and articular surface size, while Robbins et al. (2010) use cross-sectional properties.

Purpose of the Study:

• To evaluate differences in body mass estimates between Ruff (2008) and Robbins et al. (2010) methods.
• To use these differences as a heuristic to explore challenges in predicting immature body mass.
• To investigate population-specific variations in body mass predictions.

Main Methods:

• Analysis of body mass estimates from seven geographically diverse skeletal samples (n=461) of individuals under 18 years old.
• Comparison of predictions derived from Ruff (2008) and Robbins et al. (2010) formulae.
• Examination of differences in estimates across age categories and populations.

Main Results:

• Differences between the two methods were observed in some populations, potentially reflecting activity or nutritional status variations.
• Cross-sectional properties (Robbins et al., 2010) consistently produced higher body mass estimates than metaphyseal surface size (Ruff, 2008) across all age groups.
• The findings highlight the difficulty in distinguishing body mass information from loading-related data, especially with urban/industrial reference populations.

Conclusions:

• The choice of method significantly impacts body mass predictions in subadults.
• Population-specific factors like activity levels and nutrition may influence the discrepancies between prediction methods.
• Further research is needed to refine body mass estimation techniques for immature skeletal remains, considering the complexities of differentiating mass from loading indicators.