Fact · Accessibility and health
In the Part II analysis of the same cohort, the number of hours spent keying each week was associated with hand or arm symptoms and disorders.
Checked against its source on October 16, 2026
In the source's own words
“The number of hours keying/week was associated with H/A symptoms and disorders.”
A prospective study of computer users: II. Postural risk factors, Marcus M et al., American Journal of Industrial Medicine, 2002, Results.
Open the original- What it measures
- The Part II paper looked at posture and keyboard set-up as well as hours, using the same 632 participants.
- What it does not show
- This is an association. The paper reports it without a dose-response figure, so it does not give a safe number of hours.