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A validation of information on occupation--data from a nested case-control study.

Helle Soll-Johanning1, Harald Hannerz

  • 1National Institute of Occupational Health, Lersø Parkalle 105, 2100 Copenhagen, Denmark. hsj@ami.dk

International Archives of Occupational and Environmental Health
|August 13, 2002
PubMed
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Information about employment from self-respondents and proxies in a nested case-control study showed good validity. Proxies reported fewer jobs, but overall data quality was reliable, even for older individuals.

Area of Science:

  • Epidemiology
  • Occupational Health
  • Biostatistics

Background:

  • Accurate employment data is crucial for epidemiological studies, particularly case-control designs.
  • Assessing the reliability of information from self-respondents and proxies is essential for data integrity.

Purpose of the Study:

  • To evaluate the validity of employment information gathered from self-respondents and proxies against personnel records.
  • To compare data accuracy between self-respondents and proxies in a nested case-control study.

Main Methods:

  • A nested case-control study interviewed 230 self-respondents and 652 proxies regarding employment and residence.
  • Employment data from personnel records served as the gold standard for comparison.
  • Analysis included odds ratios for disagreement and comparisons between respondent types.

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Main Results:

  • Respondents generally over-reported employment duration; older individuals (over 70) showed better agreement with records.
  • No significant differences in data validity were found between cancer cases and controls, or between self-respondents and proxies.
  • Proxies reported fewer jobs and residences compared to self-respondents, but validity was independent of time since death.

Conclusions:

  • Employment data from blinded participants and interviewers in this case-control study demonstrated good validity.
  • Information quality from proxies was deemed good, with no significant impact from the time interval between death and proxy contact.
  • Interviewing elderly individuals about specific jobs is feasible when they are mentally prepared.