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Test-retest reliability of an icon/calendar-based questionnaire used to assess occupational history.

Authors
Engel-LS; Keifer-MC; Thompson-ML; Zahm-SH
Source
Am J Ind Med 2001 Nov; 40(5):512-522
NIOSHTIC No.
20032253
Abstract
Self-reported work histories can be critical for both epidemiologic and clinical purposes. However, the complexity of some work histories, such as those of migrant farm workers, can hamper recall, resulting in inaccurate reporting. Memory aids may reduce such error. This study assesses the reliability of work histories collected using such aids in the form of an icon/calendar-based questionnaire. Methods: Thirty-one males engaged in farmwork and other manual labor for a median 28 years (range: 10-64) were interviewed twice, 8-14 months apart, about their lifetime employment. In each interview, subjects were asked about important life events, which were recorded with icons on a calendar. They were then asked to recount their work history, including for each job the tasks, crops or products handled, starting and ending dates, and location. This information was recorded, job-by-job, on the calendar with icons. Results: Interquestionnaire agreement of cumulative reported employment duration (as measured by the correlation coefficient) was moderate to high across all time periods for certain crops (e.g., r = 0.69-0.92 for apple-related work), by location (e.g., r = 0.76-0.95 for Washington State), and for agricultural work in general (r = 0.67-0.94), but was lower for specific tasks. Agreement of job counts was high for total work history for certain crops (e.g., r = 0.93 for apple-related work), by location (e.g., r = 0.90 for Washington State), and for agricultural work in general (r = 0.89), but paradoxically decreased with proximity to the interview date. Agreement of both measures tended to be highest for those tasks and crops in which subjects reported spending the most time. Categorization of subjects into tertiles on the basis of either cumulative duration or counts produced results similar to those observed for job counts. Conclusions: The icon-calendar questionnaire is an effective tool for estimating cumulative duration of certain work categorizations among subjects with complex work histories
Keywords
Occupational-hazards; Epidemiology; Exposure-levels; Exposure-limits; Agriculture; Farmers; Sampling; Author Keywords: icon; calendar; questionnaire; occupational history; recall; memory aids; farmwork
Contact
Department of Epidemiology, University of Washington, Seattle, Washington
CODEN
AJIMD8
Publication Date
20011101
Document Type
Journal Article
Email Address
engell@mail.nih.gov
Funding Amount
868583
Funding Type
Cooperative Agreement
Fiscal Year
2002
NTIS Accession No.
NTIS Price
Identifying No.
Cooperative-Agreement-Number-U07-CCU-012926
ISSN
0271-3586
Priority Area
Neurotoxic Disorders; Neurotoxic-effects
Source Name
American Journal of Industrial Medicine
State
WA
Performing Organization
University of Washington, Seattle, Washington
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