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Research Progress on Accumulated Degree Days for PMI Estimation.

W H Zhu1, M Z Yang1, Z Zheng2

  • 1School of Forensic Medicine, Henan University of Science and Technology, Luoyang 471003, Henan Pro-vince, China.

Fa Yi Xue Za Zhi
|August 11, 2021
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Summary

Accumulated Degree Days (ADD) offer a more accurate method for estimating postmortem interval (PMI) than temperature alone. This approach integrates temperature and time, improving PMI estimation accuracy.

Keywords:
forensic pathology; estimation of postmortem interval; accumulated degree days; review

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Area of Science:

  • Forensic Science
  • Biometeorology
  • Thanatology

Background:

  • Temperature is a critical factor influencing postmortem interval (PMI) estimations.
  • Relying solely on temperature presents limitations in accurately determining PMI.
  • Accumulated Degree Days (ADD) incorporate both temperature and time, offering a more comprehensive approach.

Purpose of the Study:

  • To review the historical development and application of Accumulated Degree Days (ADD) in postmortem interval (PMI) estimation.
  • To identify current challenges and limitations in using ADD for PMI determination.
  • To provide insights for enhancing the accuracy of PMI estimation through improved ADD models.

Main Methods:

  • Literature review of research history concerning Accumulated Degree Days (ADD).
  • Analysis of ADD's application in the field of forensic science for PMI estimation.
  • Identification of existing problems and limitations in current ADD methodologies.

Main Results:

  • ADD models, integrating temperature and time, show potential for superior PMI estimation compared to temperature alone.
  • Established mathematical models and evaluation indicators for ADD are crucial for improving PMI accuracy.
  • Further research is needed to address the limitations faced by current ADD applications.

Conclusions:

  • Accumulated Degree Days (ADD) represent a significant advancement over single-variable temperature models for PMI estimation.
  • Developing robust mathematical models for ADD is key to enhancing forensic science capabilities.
  • Addressing the identified challenges will lead to more precise postmortem interval determinations.