Résumé
That schizophrenia does manifest for the first time in old age, has been recognized for a long time. A number of recent epidemiological studies have also documented its onset in old age. It has remained controversial, however, if schizophrenia occurring for the first time in old age is different substantially from schizophrenia manifesting at younger age. A number of efforts have been going on in recent years in different parts of the world to document differences and similarity between two groups on parameters like clinical features, family history, psychopathology, treatment response, and prognosis and outcome. Many studies have appeared on neuroimaging and neurobiology of late onset schizophrenia. Some efforts have also been done in India on this entity. The present study is to examine clinical characteristics of late onset schizophrenia on number of standardized structured instruments. The study compares its results with some well known studies.