Inter-observer variation in methodologies involving the pubic symphysis, sternal ribs, and teeth

Area of Science:

• Forensic Anthropology
• Bioarchaeology
• Human Identification

Background:

• Accurate skeletal age estimation is crucial for victim identification.
• The reliability and reproducibility of aging methods are paramount.
• Inter-observer variation in assessing skeletal and dental traits poses a challenge.

Purpose of the Study:

• To investigate the consistency of multiple investigators in assigning skeletal traits to specific aging phases.
• To assess inter-observer variation in measuring teeth and assigning tooth wear phases.
• To evaluate the repeatability of various skeletal and dental aging techniques.

Main Methods:

• Utilized skeletal data from identified individuals in Kosovo.
• Applied Todd's (10-phase) and Suchey-Brooks (6-phase) systems for pubic symphyses.
• Used Işcan's (9-phase) system for sternal rib ends and Lamendin's method for tooth measurements.
• Assessed tooth wear using Smith's (9-phase) system.
• Involved repeat measures by multiple observers and statistical analysis (Pearson's r, Wilcoxon, t-tests).

Main Results:

• Significant inter-observer variation was observed across all tested skeletal and dental aging methods.
• Experienced investigators showed a wide range of differences in assigning phase or metric data.
• Statistical tests confirmed significant differences in results among observers.

Conclusions:

• The repeatability of numerous skeletal and dental aging methodologies is difficult to achieve.
• The qualitative nature of broad, descriptive phase categories contributes to interpretation variability.
• Further investigation is needed to understand how this variation impacts age estimation accuracy.