Excess mortality after disability retirement due to mental disorders: variations by socio-demographic factors and causes of death

Abstract

Mental disorders are the key causes of disability retirement and are associated with a high risk of mortality. Social variations in excess mortality after disability retirement are nevertheless poorly understood. We examined socio-demographic differences in all-cause and cause-specific mortality after disability retirement due to depression and other mental disorders. The data comprised a nationally representative sample of the Finnish population aged 25-64 in 1996 with no prior disability retirement due to mental disorders (N=392,985). We used Cox regression analysis with disability retirement due to mental disorders as a time-varying covariate and mortality between 1997 and 2007 as the outcome variable. We found excess mortality after disability retirement due to mental disorders as compared to those with no such retirement in all specific causes of death, in particular alcohol-related causes, suicide, and other unnatural causes. Excess suicide mortality was particularly large after depression-based disability retirement. Younger age groups, non-manual classes, and those living with a partner and children had largest excess mortality, especially from unnatural and alcohol-related causes. However, the absolute number of excess deaths was not always largest in these socio-demographic groups. In young adulthood, disability retirement due to depression signifies severe health and other social disadvantages that lead to particularly large excess mortality, especially due to unnatural causes. The protective effects of a high socioeconomic position and family ties against unnatural and alcohol-related deaths are limited among those who have already developed depression or other mental disorders that have led to disability retirement.