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Appl Ergon. 2012 Jul;43(4):639-44. doi: 10.1016/j.apergo.2011.09.010. Epub 2011 Oct 24.

A replicated field intervention study evaluating the impact of a highly adjustable chair and office ergonomics training on visual symptoms.

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  • 1National Institute for Occupational Safety and Health, Analytic and Field Evaluations Branch, 1095 Willowdale Dr Road, MS-1811, Morgantown, WV 26505, USA.



Examine the effects of two office ergonomics interventions in reducing visual symptoms at a private sector worksite.


A quasi-experimental study design evaluated the effects of a highly adjustable chair with office ergonomics training intervention (CWT group) and the training only (TO group) compared with no intervention (CO group). Data collection occurred 2 and 1 month(s) pre-intervention and 2, 6 and 12 months post-intervention. During each data collection period, a work environment and health questionnaire (covariates) and daily health diary (outcomes) were completed. Multilevel statistical models tested hypotheses.


Both the training only intervention (p<0.001) and the chair with training intervention (p=0.01) reduced visual symptoms after 12 months.


The office ergonomics training alone and coupled with a highly adjustable chair reduced visual symptoms. In replicating results from a public sector worksite at a private sector worksite the external validity of the interventions is strengthened, thus broadening its generalizability.

Published by Elsevier Ltd.

[PubMed - indexed for MEDLINE]
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