Is there a relationship between major depression and both objectively assessed and perceived demands and control?

The aim of this study was to explore whether the association between depression and work characteristics (demands and control) is free from the subjective bias of employees. This study examined the relation between psychosocial work characteristics (job demands and job control) and major depression in 343 participants employed in three occupational sectors in Germany. Participants were divided into a case group and a mentally healthy control group. Since depression itself may bias the reporting of work characteristics were assessed twice: (a) objectively, by job analysis experts and (b) by employees' self-reports. Major depression was assessed according to DSM-IV criteria using an international standard clinical interview. The results showed that objective demand but not control was significantly associated with major depression. Employees who had suffered an incidence of depression had higher objective job demands than those in the control group. Self-rated job demands partially mediated the relationship between objective demands and depression. Additionally, employees in the case group perceived significantly less job control than those classed as mentally healthy. The results indicate that high job demands were associated with major depression, a finding that cannot be better explained by distorted response behaviour due to the depression. However, objectively assessed job control was not found to be related to depression.