Participatory Intervention for Workplace Improvements on Mental Health and Job Performance Among Blue-Collar Workers: A Cluster Randomized Controlled Trial

Objective: To explore the effect of participatory intervention, for workplace improvement on mental health, and job performance. Methods: Eleven assembly lines were randomly allocated to six intervention rend five, control lines (47 and 30 workers, respectively). The primary outcome runs defined as lice improvement in the, following measures during the intervention period: General Health Questionnaire and WHO Health and Work Performance Questionnaire. Results: General Health Questionnaire scores significantly deteriorated in the control lines, whereas the score remained at the same level, in lice intervention lines. Health and Work Performance Questionnaire scores increased in the intervention lines, but decreased in. lice control lines, yielding a significant intervention effect, (P = 0.048). Conclusion: It is suggested that the participatory intervention for workplace improvement is effective against deterioration in. mental health and for improving job performance. (J Occup Ernviron Med. 2009;51: 554-563)