Johnson J
Acta Psychiatr Scand. 1984 Oct;70(4):370-7. doi: 10.1111/j.1600-0447.1984.tb01222.x.
Twenty-five cases of stupor referred to a psychiatric teaching hospital over 15 years are reviewed. Ten cases presented with a depressive syndrome, four cases with catatonic phenomena and a further 10 cases with established organic aetiology; one case was considered to be psychogenic in origin. The overall mortality was high (16%), attributable to the basic pathology. Compared with earlier series there was a reduction in cases with catatonic features with a corresponding increase in the proportion of organic cases.