Reliability and Validity of the Work and Well-Being Inventory (WBI) for Self-Employed Workers: Test Norms of Employees Are Not Suitable for Entrepreneurs
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Purpose Sickness absence and work disability can be a major burden for society and for both employees and self-employed workers. Validated tools for assessing the psychosocial risk factors of long-term disability, for matching effective interventions and for deciding when to resume work can be of great value. However, no validated tools exist for self-employed workers. The purpose of this study is to adjust and to validate the Work and Wellbeing Inventory (WBI) for entrepreneurs. Methods The sample consisted of 676 self-employed workers with a private disability insurance policy. Three groups were distinguished: business owners, liberal professions and doctors and paramedics. Reliability, construct validity and concurrent validity of the WBI were examined. Scale scores were calculated for each group of self-employed workers and compared with the scores of a representative group of 912 Dutch employees to test the adequacy of the existing (employee) test norms. Results The WBI for the self-employed showed good to excellent reliability figures. The construct validity and the concurrent validity of the WBI could be confirmed. Overall, the self-employed scored higher on job satisfaction, social support at work and perfectionism (diligence) and had fewer mental health problems compared to employees. Self-employed workers should not be treated as one group, as there were important differences between entrepreneurs, liberal professions and doctors and paramedics. Conclusions The reliability and validity of the WBI were confirmed. Important differences in the scores of employees and the self-employed were revealed. In addition, the group of self-employed workers appeared to be rather heterogeneous.
KeywordsScreening tool Return to work Occupational health care Self-employed
Compliance with Ethical Standards
Conflict of interest
Lex Vendrig has developed the WBI (Dutch: VAR-2) and he participates in a project to support the online application of the VAR-2 (project: VAR-2-app). Frederieke Schaafsma and Liesbeth Wijnvoord declare they have no conflicts of interests.
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
Informed consent was obtained from all individual participants included in the study.
- 7.Hatfield I. Self-employment in Europe. 2014. http://www.ippr.org/.
- 8.OECD. Self-employment rate (indicator). https://doi.org/10.1787/fb58715e-en. Accessed 09 Sept 2018.
- 9.https://opendata.cbs.nl/statline/#/CBS/nl/dataset/82309NED/table?ts=1536326590802. Accessed 15 Dec 2018.
- 14.Zimet GD, Dahlem NW, Zimet SG, Farley GK. The multidimensional scale of perceived social support. J Pers Assess. 1988;52(1):30–41.Google Scholar
- 17.Houtman I. Reliability and validity of the Dutch version of the karasek job content questionnaire. In: NIOSH/APA conference on stress, work and health. Washington, DC: APA; 1995.Google Scholar
- 18.van der Doef M, Maes S. The job demand-control (-support) model and psychological well-being: a review of 20 years of empirical research. Work Stress. 1999;13(2):87–114.Google Scholar
- 20.Pavot WG, Diener E. Review of the satisfaction with life scale. Psychol Assess. 1993;5(2):164–172.Google Scholar
- 21.Duijsens IJ, Spinhoven Ph, Goedkoop JG, Spermon T, Eurelings-Bontekoe EHM. The Dutch temperament and character inventory (TCI): dimensional structure, reliability and validity in a normal and psychiatric outpatient sample. J Pers Ind Differ. 2000;28(3):487–499.Google Scholar
- 23.Lovibond SH, Lovibond PF. Manual for the depression anxiety stress scales. Sydney: Psychology Foundation; 1995.Google Scholar
- 25.Nieuwenhuijsen K, de Boer AGEM, Verbeek JHAM, Blonk RWB, van Dijk FJH. The Depression Anxiety Stress Scales (DASS): detecting anxiety disorder and depression in employees absent from work because of mental health problems. Occup Environ Med. 2002;60(Suppl I):77–82.Google Scholar
- 26.Ware JE, Sherbourne CD. The MOS 36-item short-form health survey (SF-36): I. conceptual framework and item selection. Med Care. 1992;30(6):473–483.Google Scholar
- 29.Terluin B, van Marwijk HWJ, Adèr HJ, de Vet HCW, Penninx B, Hermens M, van Boeijen CA, Balkom A, van der Klink JJL, Stalman WAB. The four-dimensional symptom questionnaire (4DSQ): a validation study of a multidimensional self-report questionnaire to assess distress, depression, anxiety and somatization. BMC Psychiatry. 2006;6(1):1–20.Google Scholar
- 30.McHugh ML. Interrater reliability: the kappa statistic. Biochem Med. 2012;22(3):276–282.Google Scholar
- 31.Dijkhuizen J, Van Veldhoven M, Schalk R. Development and validation of the Entrepreneurial Job Demands Scale. Int J Knowl Innov Entrep. 2014;2(1):70–88.Google Scholar
- 32.Dijkhuizen J, Gorgievski M, van Veldhoven M, Schalk R. Feeling successful as an entrepreneur: a job demands-resources approach. Int Entrep Manag J. 2016;12(2):555–573.Google Scholar
- 33.Abma F, Bültmann U, Amick Iii BC, Arends I, Dorland HF, Flach PA, van der Klink JJL, van de Ven HA, Bjørner JB. The work role functioning questionnaire v2.0 showed consistent factor structure across six working samples. J Occup Rehabil. 2017;28(3):465–475. https://doi.org/10.1007/s10926-017-9722-1.PubMedCentralGoogle Scholar
- 35.Amoafo E, Hanbali N, Patel A, Singh P. What are the significant factors associated with burnout in doctors? Occup Med. 2015;65(2):117–121.Google Scholar