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Psychometric properties and differential explanation of a short measure of effort–reward imbalance at work: A study of industrial workers in Germany
Author(s) -
Li Jian,
Loerbroks Adrian,
Jarczok Marc N.,
Schöllgen Ina,
Bosch Jos A.,
Mauss Daniel,
Siegrist Johannes,
Fischer Joachim E.
Publication year - 2012
Publication title -
american journal of industrial medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.7
H-Index - 104
eISSN - 1097-0274
pISSN - 0271-3586
DOI - 10.1002/ajim.22018
Subject(s) - cronbach's alpha , structural equation modeling , medicine , confirmatory factor analysis , reliability (semiconductor) , criterion validity , internal consistency , psychometrics , clinical psychology , statistics , power (physics) , physics , mathematics , quantum mechanics
Background We test the psychometric properties of a short version of the Effort–Reward Imbalance (ERI) questionnaire in addition to testing an interaction term of this model's main components on health functioning. Methods A self‐administered survey was conducted in a sample of 2,738 industrial workers (77% men with mean age 41.6 years) from a large manufacturing company in Southern Germany. The internal consistency reliability, structural validity, and criterion validity were analyzed. Results Satisfactory internal consistencies of the three scales: “Effort”, “reward”, and “overcommitment”, were obtained (Cronbach's alpha coefficients 0.77, 0.82, and 0.83, respectively). Confirmatory factor analysis showed a good model fit of the data with the theoretical structure (AGFI = 0.94, RMSEA = 0.060). Evidence of criterion validity was demonstrated. Importantly, a significant synergistic interaction effect of ERI and overcommitment on poor mental health functioning was observed (odds ratio 6.74 (95% CI 5.32–8.52); synergy index 1.78 (95% CI 1.25–2.55)). Conclusions This short version of the ERI questionnaire is a reliable and valid tool for epidemiological research on occupational health. Am. J. Ind. Med. 55:808–815, 2012. © 2012 Wiley Periodicals, Inc.