An Analysis of the Differences Between Unionised and Non-Unionised Workers in Psychological Well-Being, Job Satisfaction, and Life Satisfaction: A Study in Organisations Located in the Basque Country

Given the limited literature on the association between trade unions and mental health, this study aims to analyse differences between unionised and non-unionised workers in terms of psychological well-being, job satisfaction, and overall life satisfaction. These differences were analysed based on a sample of 260 workers from organisations located in the Basque Country, of whom 144 were members of a trade union and 116 were not. Our results suggest significant differences between unionised and non-unionised workers in terms of autonomy (t = 3.10; p < 0.01), environmental mastery (t = 2.20; p < 0.05), and personal growth (t = 2.10; p < 0.05), with trade union members demonstrating higher mean scores in all three metrics than their non-unionised counterparts. The results also revealed significant differences in job satisfaction (t = −0.31; p < 0.01), although non-unionised workers scored higher than their unionised counterparts. Contrary to expectations, no differences were found between the groups in relation to overall life satisfaction. After discussing the results, the main limitations of the study are described, and some proposals are made for future research.