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World Journal of Surgery

, Volume 36, Issue 7, pp 1562–1570 | Cite as

The Distribution of Survival Times after Injury

  • David E. ClarkEmail author
  • Jing Qian
  • Kristen C. Sihler
  • Lee D. Hallagan
  • Rebecca A. Betensky
Article

Abstract

Introduction

The distribution of survival times after injury has been described as “trimodal,” but several studies have not confirmed this. The purpose of this study was to clarify the distribution of survival times after injury.

Methods

We defined survival time (ts) as the interval between injury time and declared death time. We constructed histograms for ts ≤ 150 min from the 2004–2007 Fatality Analysis Reporting System (FARS, for traffic crashes) and National Violent Death Reporting System (NVDRS, for homicides). We estimated statistical models in which death times known only within intervals were treated as interval-censored. For confirmation, we also obtained EMS response times (tr), prehospital times (tp), and hospital times (th) for decedents in the 2008 National Trauma Data Bank (NTDB) with ts = tp + th ≤ 150. We approximated times until circulatory arrest (tx) as tr for patients pulseless at the injury scene, tp for other patients pulseless at hospital admission, and ts for the rest; for any declared ts, we calculated mean tx/ts. We used this ratio to estimate tx for hospital deaths in FARS or NVDRS and provide independent support for using interval-censored methods.

Results

FARS and NVDRS deaths were most frequent in the first few minutes. Both showed a second peak at 35–40 min after injury, corresponding to peaks in hospital deaths. Third peaks were not present. Estimated tx in FARS and NVDRS did not show second peaks and were similar to estimates treating some death times as interval-censored.

Conclusions

Increases in frequency of survival times at 35–40 min are primarily artifacts created because declaration of death in hospitals is delayed until completing resuscitative attempts. By avoiding these artifacts, interval censoring methods are useful for analysis of injury survival times.

Keywords

Emergency Medical Service Circulatory Arrest Death Time Suicide Death Hospital Arrival 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

Supported by Grant R01CE001594 from the National Center for Injury Prevention and Control. Content reproduced from the National Trauma Data Bank remains the full and exclusive copyrighted property of the American College of Surgeons. The American College of Surgeons is not responsible for any claims arising from works based on the original data, text, tables, or figures.

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Copyright information

© Société Internationale de Chirurgie 2012

Authors and Affiliations

  • David E. Clark
    • 1
    • 2
    Email author
  • Jing Qian
    • 3
  • Kristen C. Sihler
    • 1
  • Lee D. Hallagan
    • 1
  • Rebecca A. Betensky
    • 3
  1. 1.Department of SurgeryMaine Medical CenterPortlandUSA
  2. 2.Harvard School of Public HealthHarvard Injury Control Research CenterBostonUSA
  3. 3.Department of BiostatisticsHarvard School of Public HealthBostonUSA

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