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Interobserver Reliability of the Total Body Score System for Quantifying Human Decomposition.

Gretchen R Dabbs1, Melissa Connor2, Joan A Bytheway3

  • 1Southern Illinois University, Department of Anthropology, 1000 Faner Dr., Mail Code 4502, Carbondale, IL, 62901.

Journal of Forensic Sciences
|July 13, 2016
PubMed
Summary

The Total Body Score (TBS) method for decomposition analysis demonstrates high interobserver reliability. This forensic science tool shows "almost perfect" agreement, confirming its dependability for quantifying decomposition stages.

Keywords:
Total Body Scoredecompositionforensic anthropologyforensic scienceinterobserver errorreliabilitytaphonomy

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Area of Science:

  • Forensic Anthropology
  • Forensic Science
  • Taphonomy

Background:

  • Accurate quantification of decomposition is crucial in forensic investigations.
  • Previous studies focused on the accuracy of the Total Body Score (TBS) method.
  • Interobserver reliability of the TBS method has not been previously assessed.

Purpose of the Study:

  • To evaluate the interobserver reliability of the Total Body Score (TBS) method.
  • To determine the error rates associated with TBS scoring by multiple observers.
  • To identify potential areas for improving TBS method reliability.

Main Methods:

  • Sixteen participants scored 59 observation packets of human cadavers in various decomposition stages.
  • Data included photographs and written descriptions of 13 cadavers with postmortem intervals ranging from 2 to 186 days.
  • Statistical analysis employed a two-way random model intraclass correlation in SPSS (v. 17.0).

Main Results:

  • The TBS method exhibited "almost perfect" agreement between observers.
  • Average absolute correlation coefficients were 0.990, and average consistency correlation coefficients were 0.991.
  • The trunk component scores showed the least concordance among individual scores.

Conclusions:

  • The Total Body Score (TBS) method demonstrates high reliability for quantifying decomposition.
  • Scoring reliability is not a significant source of error for the TBS method.
  • Suggestions are provided to enhance the reliability of specific TBS components, particularly the trunk score.