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Quantifying the use of keyboard/mouse through intranet.

NIOSH 2001 Apr :1-68
A software-based tool was developed in this study to quantify the use of keyboard and mouse through the Intranet. The feasibility and utility of the software-based tool was demonstrated in a field study that profiled 98 non clerical professionals' use of keyboard and mouse during the course of their workday. With the use of the software-based tool, the study quantified for each participant his/her computer on duration, actual duration of keyboard and mouse usage, total number of keystrokes and mouse clicks, and total number of rest breaks from the computer. The results showed that these technical professionals had their computers on for durations ranging from 115 minutes to 700 minutes during the day of the study. However, the actual duration of VDT usage ranged from 3 minutes to 316 minutes. There was no significant gender difference in the computer-on duration or in the actual VDT usage duration. The total number of keystrokes made by these participants ranges from 203 keys to 18,242 keys (Mean: 5,086; SD: 4,386 keys). The total number of mouse clicks, including left and right, single and double clicks, made during the workday ranged from 27 clicks to 5,749 clicks (Mean: 1,045; SD 940 clicks). There was a significant gender difference in the number of keystrokes made during the workday. Females made more than twice as many keystrokes as males during the workday: 5,957 vs. 2,794 keys, (p<.01). There was no statistically significant gender difference in the number of mouse clicks made in the workday. Participants also rated their musculoskeletal discomfort using a 10 point Borg scale. Mantel Haenezel chi square statistic showed that the prevalence of self-perceived wrist and back discomfort was associated with the actual VDT usage duration and with the total number of mouse clicks made in a workday. The results of logistic regression analysis, however, did not show any statistically significant association between the prevalence of self-perceived discomfort and the exposure estimates.
Computer-equipment; Computer-software; Computers; Keyboard-operators; Carpal-tunnel-syndrome; Musculoskeletal-system-disorders
University of California, Los Angeles, School of Public Health, Center for Occupational and Environmental Health, 10833 Le Conte Avenue, Los Angeles, CA 90095
Publication Date
Document Type
Final Grant Report
Funding Amount
Funding Type
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
NIOSH Division
Priority Area
Disease and Injury: Musculoskeletal Disorders of the Upper Extremities
Source Name
National Institute for Occupational Safety and Health
Performing Organization
University of California Los Angeles, School of Public Health, Los Angeles, California