The Norwegian Knowledge Centre for the Health Services (NOKC) was asked by the The Norwegian Institute of Public Health to systematically review the research about the effects of workplace-based interventions for employees’ mental health.

We included three systematic reviews of high quality:

• Preventing occupational stress in healthcare workers
• Psychosocial interventions for prevention of psychological disorders in law enforcement officers
• Flexible working conditions for all employees

• Stress management for health personnel probably reduces the risk of anxiety. There is probably a positive short-tem effect on stress and burn-out. The quality of the evidence is low.
• It is uncertain if mental image training, physical training or stress management have an effect on anxiety, depression, post-traumatic stress, stress or burn-out in police personnel. The quality of the evidence is very low.
• It is uncertain if gradual retirement, or involuntary part-time work has an effect on employees’ mental health. It is uncertain if flexible work arrangements reduces stress, mental strain, or affect the quality of life, restitution, self image, quality of sleep, and alertness in employees. The quality of the evidence is very low.
• We did not find documentation on workplace-based interventions for employees’ mental health for outcomes such as employees' function, productivity, absense, disability, sick-leave, costs and adverse events.