Intra- and interobserver error of the Greulich-Pyle method as used on a Danish forensic sample

Area of Science:

• Forensic Medicine
• Radiology
• Odontology

Background:

• The University of Copenhagen's Forensic Medicine section conducts age evaluations for legal purposes.
• Standard procedures include physical, odontological, and carpal X-ray examinations.

Purpose of the Study:

• To assess the intra- and interobserver reliability of the Greulich and Pyle Atlas (GPA) method for carpal X-ray age estimation.
• To compare age estimations derived from carpal X-rays with odontological age assessments.

Main Methods:

• Retrieved 159 cases from 2000-2002 for analysis.
• Conducted blind trials for intra- and interobserver error testing of carpal X-rays using the GPA method.
• Compared carpal X-ray age estimations with odontological age estimations.

Main Results:

• Small overall intra- and interobserver errors were observed.
• Full agreement between experienced users and novices in 126 out of 159 cases.
• Mean difference in age estimation was 0.053 years (SD +/-0.567 years).

Conclusions:

• The GPA method is simple and reproducible, even for non-experienced users.
• Potential discrepancies in age estimation for older juveniles between odontologists and radiologists suggest a need for further research on diverse populations.
• Advised adherence to standard deviations and consideration of reference population limitations when using the GPA method in legal cases.