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Validity Assessment of Self-Reported Construction Tasks. Final Performance Report.

PB97207187

Publication Date	1997
Personal Author	Hunting, K.
Page Count	40
Abstract	An observational study was conducted among sheet metal workers to evaluate the validity of self reported exposures to construction work tasks. Subjects included 49 shop workers and 52 construction site sheet metal workers. Tasks were divided into major (1 hour or more) and minor (less than 1 hour). Workers were observed for about 25% of the work day, for 3 days. Subjects completed a questionnaire each day indicating tasks done, time spent on each, the size of materials for each task, and the number of times each power tool was used. Worker estimates were compared with observations. Sheet metal workers in the shop tended to specialize in particular tasks, while construction workers showed greater day to day variability. The authors conclude that workers tended to overestimate the amount of time spend at major tasks, and to underestimate the amount of time spent at shorter duration tasks. The primary sources of the errors for the workers were a definition of the tasks, and remembering how the day was spent. For the observer the primary sources of error were in the definition of the tasks, and sampling error from observing each worker for only about one quarter of the day.
Keywords	Occupational safety and health Musculoskeletal system disorders Construction Metalworking industry Task performance Human factors engineering Ergonomics Data processing
Source Agency	National Institute for Occupational Safety and Health
Corporate Authors	George Washington Univ. Medical Center, Washington, DC. Dept. of Medicine.; National Inst. for Occupational Safety and Health, Cincinnati, OH.
Supplemental Notes	Sponsored by National Inst. for Occupational Safety and Health, Cincinnati, OH.
Document Type	Technical Report
Title Note	Rept. for 30 Sep 94-29 Sep 96.
NTIS Issue Number	199724

Validity Assessment of Self-Reported Construction Tasks. Final Performance Report.

Validity Assessment of Self-Reported Construction Tasks. Final Performance Report.
PB97207187

Publication Date	1997
Personal Author	Hunting, K.
Page Count	40
Abstract	An observational study was conducted among sheet metal workers to evaluate the validity of self reported exposures to construction work tasks. Subjects included 49 shop workers and 52 construction site sheet metal workers. Tasks were divided into major (1 hour or more) and minor (less than 1 hour). Workers were observed for about 25% of the work day, for 3 days. Subjects completed a questionnaire each day indicating tasks done, time spent on each, the size of materials for each task, and the number of times each power tool was used. Worker estimates were compared with observations. Sheet metal workers in the shop tended to specialize in particular tasks, while construction workers showed greater day to day variability. The authors conclude that workers tended to overestimate the amount of time spend at major tasks, and to underestimate the amount of time spent at shorter duration tasks. The primary sources of the errors for the workers were a definition of the tasks, and remembering how the day was spent. For the observer the primary sources of error were in the definition of the tasks, and sampling error from observing each worker for only about one quarter of the day.
Keywords	Occupational safety and health Musculoskeletal system disorders Construction Metalworking industry Task performance Human factors engineering Ergonomics Data processing
Source Agency	National Institute for Occupational Safety and Health
Corporate Authors	George Washington Univ. Medical Center, Washington, DC. Dept. of Medicine.; National Inst. for Occupational Safety and Health, Cincinnati, OH.
Supplemental Notes	Sponsored by National Inst. for Occupational Safety and Health, Cincinnati, OH.
Document Type	Technical Report
Title Note	Rept. for 30 Sep 94-29 Sep 96.
NTIS Issue Number	199724