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Developing Interview Questions to Estimate Workplace Exposure to Electric and Magnetic Fields

This study has been completed.
Information provided by:
National Institutes of Health Clinical Center (CC) Identifier:
First received: June 19, 2006
Last updated: March 7, 2012
Last verified: March 2012

RATIONALE: Electric and magnetic fields may increase the risk of cancer. Developing interview questions that accurately estimate a person's exposure to electric and magnetic fields may help doctors learn about the long-term effects of workplace exposure.

PURPOSE: This clinical trial is developing interview questions that can be used in estimating workplace exposure to electric and magnetic fields.

Condition Intervention
Brain and Central Nervous System Tumors
Other: questionnaire administration
Procedure: study of high risk factors

Study Type: Observational
Official Title: Assessment of Occupational EMF Exposure - Validation of Interview Procedures Used in Brain Tumor Study

Resource links provided by NLM:

Further study details as provided by National Institutes of Health Clinical Center (CC):

Primary Outcome Measures:
  • Validation of an interview-based electric and magnetic field (EMF) exposure assessment algorithm
  • Calibration of algorithm parameters
  • Correlation between EMF exposure estimates from the algorithm with biologically based metrics measured by new instrumentation

Estimated Enrollment: 108
Study Start Date: October 2005
Study Completion Date: March 2007
Detailed Description:


  • Validate an interview-based electric and magnetic field exposure (EMF) assessment algorithm against measurements of the time-weighted average magnetic field magnitude used in previous epidemiologic studies.
  • Calibrate the parameters in the algorithm in order to improve the exposure estimates.
  • Correlate EMF exposure estimates from the algorithm with biologically based metrics measured by new instrumentation.

OUTLINE: Participants respond to questions during a 5- to 15-minute telephone interview concerning workplace exposure to electric and magnetic (EMF) fields. Data is collected during the interview using an exposure assessment algorithm designed to estimate EMF workplace exposure based on participants' responses. The interview-based estimates are then validated against actual field measurements of magnetic field exposure captured by Emdex multiwave monitors located at participating sites.


Ages Eligible for Study:   18 Years to 65 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No


  • Meets 1 of the following occupation criteria:

    • Three occupations that primarily work in offices at Lawrence Livermore National Laboratories (LLNL)
    • Three occupations that do nonelectric manual work (e.g., machinists and laborers) at LLNL


  • Not specified


  • Not specified
  Contacts and Locations
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Please refer to this study by its identifier: NCT00340054

United States, California
Exponent, Inc.
Menlo Park, California, United States, 94025
United States, Ohio
National Institute for Occupational Safety and Health
Cincinnati, Ohio, United States, 45226
Sponsors and Collaborators
Study Chair: Joseph Coble, DSc National Cancer Institute (NCI)
  More Information

Additional Information:
Publications: Identifier: NCT00340054     History of Changes
Obsolete Identifiers: NCT00481910
Other Study ID Numbers: 99906013, 06-C-N013, 999906013, CDR0000551595
Study First Received: June 19, 2006
Last Updated: March 7, 2012
Health Authority: United States: Federal Government

Keywords provided by National Institutes of Health Clinical Center (CC):
brain tumor

Additional relevant MeSH terms:
Central Nervous System Neoplasms
Neoplasms by Site
Nervous System Diseases
Nervous System Neoplasms processed this record on March 03, 2015