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Updated: May 27, 2026
How to Detect Amygdala Activity with Magnetoencephalography using Source Imaging
Published on: June 3, 2013
New electric-shock job exposure matrix
Ximena P Vergara1, Leeka Kheifets, Michael Silva
1Department of Epidemiology, UCLA School of Public Health, Los Angeles, California, USA. xvergara@ucla.edu
Background:
To evaluate a consistent association between jobs in "electric" occupations and amyotrophic lateral sclerosis (ALS), a comprehensive job exposure matrix (JEM) that includes electric shocks and magnetic fields (MF) is needed.
Methods:
We used incident electric shocks and electrocutions from two available data sources along with expert judgment to create a JEM that was integrated into an existing MF JEM. The final JEM contained ordinal electric-shock exposure assignments for 501 job titles.
Results:
Main occupational groups experiencing the electric shocks were precision production, craft, and repair occupations. Specific jobs with the highest proportion of shocks per 100,000 workers were: electrical apprentices (99.7), mechanic and repairer helpers (74.0), hoist and winch operators (63.3), and electrical power installers (52.4). Examples of job titles with low electric-shock exposures were administrative support occupations, data-key entry operators, and waiters and waitresses.
Conclusions:
Combining publicly available data with an expert panel is a viable method to construct an electric-shock MF JEM. This JEM will allow an evaluation of association between electric shocks and neurodegenerative diseases.
