Construct Validity of the Thai Version of the Job Content Questionnaire in a Large Population of Heterogeneous Occupations
Pitchaya Phakthongsuk MD, PhD*
Affiliation : * Occupational Health Unit, Community Medicine Department, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkhla, Thailand
Objective : To test the construct validity of the Thai version of the job content questionnaire (TJCQ).
Material and Method: The present descriptive study recruited 10415 participants from all occupations
according to the International Standard Classification of Occupations. The instrument consisted of a 48-item
of the job content questionnaire. Eight items newly developed by the authors from in-depth interviews were
added.
Results : Exploratory factor analysis showed six factor models of work hazards, decision latitude, psychological
demand, social support, physical demand, and job security. However, supervisor and co-worker support
were not distinguished into two factors and some items distributed differently along the factors extracted.
Confirmatory factor analysis supported the construct of six latent factors, although the overall fit was
moderately acceptable. Cronbach’s alpha coefficients higher than 0.7, supported the internal consistency of
TJCQ scales except for job security (0.55).
Conclusion : These findings suggest that TJCQ is valid and reliable for assessing job stress among Thai
populations.
Keywords : Job Satisfaction, Occupational diseases, Questionnaires, Reproducibility of results, Stress, psy- chological, Workplace
