Test-retest reliability and validity of self-reported duration of computer use at work

Scand J Work Environ Health. 2008 Apr;34(2):113-9. doi: 10.5271/sjweh.1220. Epub 2008 May 12.


Objectives: The aims of this study were to evaluate the test-retest reliability and the validity of self-reported duration of computer use at work.

Methods: Test-retest reliability was studied among 81 employees of a research department of a university medical center. The employees filled out a web-based questionnaire twice with an in-between period of 14 days. Validity was studied among a group of 572 office workers who participated in an epidemiologic field study. A software program recorded the duration of computer use at work during the 3 months preceding the questionnaire.

Results: The percentages of agreement for test-retest reliability were 75% [95% confidence interval (95% CI) 64-84] for total computer use and 67% (95% CI 55-77) for mouse use. The percentages of agreement between self-report and registration were 18% (95% CI 15-21) for total computer use and 16% (95% CI 13-19) for mouse use. Misclassification was mainly nondifferential in nature, since all of the evaluated subgroups showed at least 75% misclassification.

Conclusions: The use of self-reports lead to the misclassification of exposure to computer use for more than 80% of all persons. This misclassification is predominantly nondifferential in nature and can only partly be explained by limited test-retest reliability.

Publication types

  • Validation Study

MeSH terms

  • Adult
  • Computers*
  • Cumulative Trauma Disorders / prevention & control
  • Female
  • Humans
  • Male
  • Middle Aged
  • Musculoskeletal Diseases / prevention & control
  • Netherlands
  • Occupational Exposure / statistics & numerical data*
  • Reproducibility of Results
  • Surveys and Questionnaires*
  • Workload*