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Updated: Jan 8, 2026

Trajectory Data Analyses for Pedestrian Space-time Activity Study
Published on: February 25, 2013
When Do Workplace Injuries Occur? A Temporal Analysis of the First Reporting Year of the Injury Tracking Application
Barrak Alahmad1, Gregory R Wagner1, David Michaels2
1From the Environmental Health Department (B.A., G.R.W.), Harvard T.H. Chan School of Public Health, Harvard University, Boston, Massachusetts.
Objectives:
In 2023, OSHA began requiring large establishments (≥100 employees) to submit detailed case reports of injuries electronically. These reports have been organized into a publicly available data system, called the Injury Tracking Application (ITA).
Methods:
We analyzed timestamps of 738,828 injuries to investigate injury patterns by month, weekday, hour, and daylight-saving time transitions in 2023 using quasi-Poisson rate regression and interrupted time-series models.
Results:
Injuries were not evenly distributed over time: certain months, days, and hours showed markedly higher rates. Injuries peaked around July and August. A 10 am peak was observed across several industries. The fall daylight-saving shift increased injuries, whereas the spring shift did not show a significant effect.
Conclusions:
Understanding "when" workplace injuries happen can inform timely interventions. This study is a proof-of-concept demonstration of how the newly released ITA case dataset from large establishments can be used to explore national-scale injury patterns.
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