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The British Journal of Psychiatry 173: 494-500 (1998)
© 1998 The Royal College of Psychiatrists
JM Suvisaari, J Haukka, A Tanskanen and JK Lonnqvist
Department of Mental Health and Alcohol Research, National Public Health Institute, Helsinki, Finland. jaana.suvisaari@kt1.fi
BACKGROUND: Recent research suggests that high familial loading is associated with early onset of schizophrenia. Results concerning outcome have been controversial. METHOD: We assessed the relationship between familial loading, age at onset and outcome in all Finnish patients with schizophrenia born between 1950 and 1969. Patients and their first-degree relatives were identified using nationwide registers. Familial loading scores were calculated for schizophrenia and for combined psychotic disorders, and patients were accordingly classified into three groups: high (n = 761), intermediate (n = 14,247), and low familial loading (n = 725). Linear mixed models and the Cox proportional hazard model were used in the analyses. RESULTS: Onset was earliest, hospitalisation longest and risk of retirement in receipt of a disability pension highest in the group with high familial loading, with opposite extremes found in the group with low familial loading. CONCLUSIONS: High familial loading for schizophrenia is associated with early onset and poor outcome of schizophrenia.
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