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ORIGINAL PAPER
 
CC BY-NC 3.0 Polska
 
 

Portuguese version of the Swedish Occupational Fatigue Inventory (SOFI) among assembly workers: Cultural adaptation, reliability and validity

Joana Santos 1, 2, 3  ,  
Tiago Coelho 5,  
 
1
Polytechnic Institute of Porto, Porto, Portugal (Scientific Area of Environmental Health and Research Centre on Health and Environment (CISA), School of Health (ESS – P.Porto))
2
Polytechnic Institute of Porto, Porto, Portugal (Activity and Human Movement Study Center (CEMAH), School of Health (ESS – P.Porto))
3
University of Porto, Porto, Portugal (Porto Biomechanics Laboratory, Institute of Mechanical Engineering and Industrial Management (LABIOMEP/INEGI), Faculty of Engineering)
4
ISPA – University Institute, Lisbon, Portugal (William James Center for Research)
5
Polytechnic Institute of Porto, Porto, Portugal (Scientific Area of Occupational Therapy, School of Health (ESS – P.Porto))
Int J Occup Med Environ Health 2017;30(3):407–417
KEYWORDS:
TOPICS:
ABSTRACT:
Objectives: Reliable and valid instruments are essential for understanding fatigue in occupational settings. This study analyzed the psychometric properties of the Portuguese version of the Swedish Occupational Fatigue Inventory (SOFI). Material and Methods: A cross-sectional study was conducted with 218 workers from an automotive industry involved in assembly tasks for fabrication of mechanical cables. Convergent and discriminant validity, internal consistency reliability and confirmatory factor analysis were performed. Results: Results showed adequate fit to data, yielding a 20-item, 5-factor structure (all intercorrelated): Chi2/df (ratio Chi2 and degrees of freedom) = 2.530, confirmatory fit index (CFI) = 0.919, goodness of fit index (GFI) = 0.845, root mean square error of approximation (RMSEA) = 0.084. The SOFI presented an adequate internal consistency, with the sub-scales and total scale presenting good reliability values (Cronbach’s α values from 0.742 to 0.903 and 0.943 respectively). Conclusions: Findings suggest that the Portuguese version of the SOFI may be a useful tool to assess fatigue and prevent work-related injuries. In future research, other instruments should be used as an external criterion to correlate with the SOFI dimensions. Int J Occup Med Environ Health 2017;30(3):407–417
CORRESPONDING AUTHOR:
Joana Santos   
Polytechnic Institute of Porto, Scientific Area of Environmental Health, School of Health (ESS – P.Porto), Rua Dr. António Bernardino De Almeida 400, 4200-072 Porto, Portugal
eISSN:1896-494X
ISSN:1232-1087