>Twin survey. A total of 452 index-twins were found in the approximately 30,000 medical records of the psychiatric hospitals in the region of Lower Franconia (Lohr and Werneck psychiatric hospitals, University Clinic of Würzburg), i.e. approximately one in every 66 patients could be identified as a twin birth. This is more or less in line with the frequency of twins in the general population so that no significant number of twins receiving psychiatric inpatient treatment was overlooked. According to the medical records, the twin’s partner had already died in 82 cases. Of the remaining 370 index-twins with a surviving co-twin at the time of hospitalization, 234 pairs were of the same sex and 136 pairs were of the opposite sex. According to the diagnosis in the medical records, 121 of the same-sex index-twins suffered from endogenous psychoses, and 113 index-twins had other diagnoses (addiction, neurosis, organic brain disease etc.). According to the medical records, 77 index- twins from 66 pairs had ICD 9 diagnoses that belong to the category of the schizophrenic spectrum. One partner was already deceased at the time of the study in six of the 66 pairs. In eight of the remaining 60 pairs (13%), one or both partners refused to participate in the study. The personal examination was unable to confirm the diagnosis of a psychosis of the schizophrenic spectrum in five pairs. The study is therefore based on a total of 47 same-sex twin pairs with at least one index-twin suffering from a psychosis of the schizophrenic spectrum.
KeywordsPsychiatric Care Discordant Pair Delusional Disorder Persecutive Delusion Formal Thought Disorder
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