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 and five control lines (47 and 50 workers, respectively). The primary outcome was defined as the 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 the intervention lines. Health and Work Performance Questionnaire scores increased in the intervention lines, but decreased in the control lines, yielding a significant intervention effect (P = 0.048).


CONCLUSIONS
It is suggested that the participatory intervention for workplace improvement is effective against deterioration in mental health and for improving job performance.
Tsutsumi
Akizumi
A
Occupational Health Training Center, University of Occupational and Environmental Health, Yahatanishi-ku, Kitakyushu, Japan. tsutsumi@med.uoeh-u.ac.jp
Nagami
Makiko
M
Yoshikawa
Toru
T
Kogi
Kazutaka
K
Kawakami
Norito
N
D000328:Adult; D005260:Female; D006293:Health Promotion / Q000379:methods*; D006801:Humans; D007400:Interprofessional Relations; D007588:Job Satisfaction; D008297:Male; D008603:Mental Health; D008875:Middle Aged; D016272:Occupational Health; D009790:Occupations; D015279:Organizational Culture; D026684:Personal Autonomy; D017751:Safety Management; D013315:Stress, Psychological; D011795:Surveys and Questionnaires; D017132:Workplace / Q000523:psychology*; D055815:Young Adult