Mortality in schizophrenia and schizoaffective disorder: an Olmsted County, Minnesota cohort: 1950-2005

Abstract

Introduction: Increased mortality in people with schizophrenia, compared to the general population, has been consistently reported worldwide. This mortality has been attributed predominantly to "unnatural" deaths-suicide, accidents, and homicide. Recent studies have shown an increase in natural causes of death. Our objective is to compare the mortality of schizophrenic and schizoaffective subjects to the general US population.

Methods: 319 Olmsted County residents meeting DSM-IV-TR criteria for schizophrenia or schizoaffective disorder seen at the Mayo Clinic between 1950 and 1980 were followed until February 2005 for a median of 23.5 years.

Results: At the end of follow-up, 44% of patients were deceased. Mortality was significantly (p<0.001) increased compared to the Caucasian population in the US for persons of like age, gender, and calendar year of birth. The median survival following diagnosis was 36.2 years. Death certificate cited cause of death was cardiac (29%), cancer--including lung (19%), and pulmonary disease (17%). Concerningly, there was no association with the year of diagnosis to survival.

Conclusions: Tsuang and colleagues showed in 1975 that mortality in schizophrenics and later, those with schizoaffective disorder was significantly increased compared to the US general population. Thirty years later, with a demographically similar population, we have found the same pattern of increased mortality. In light of continued improvements in the general population's lifespan, the survival gap in schizophrenia/schizoaffective disorder appears to be increasing.