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.
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.
Authors: Sigurd Mikkelsen; Christina Funch Lassen; Imogen Vilstrup; Ann Isabel Kryger; Lars Peter Andreas Brandt; Jane Frølund Thomsen; Mette Gerster; Søren Grimstrup; Johan Hviid Andersen Journal: Int Arch Occup Environ Health Date: 2011-05-24 Impact factor: 3.015
Authors: Erwin M Speklé; Marco J M Hoozemans; Birgitte M Blatter; Judith Heinrich; Allard J van der Beek; Dirk L Knol; Paulien M Bongers; Jaap H van Dieën Journal: BMC Musculoskelet Disord Date: 2010-05-27 Impact factor: 2.362
Authors: Stefan Ijmker; Maaike A Huysmans; Allard J van der Beek; Dirk L Knol; Willem van Mechelen; Paulien M Bongers; Birgitte M Blatter Journal: Occup Environ Med Date: 2010-11-02 Impact factor: 4.402