Although genetic and environmental factors operating before or around the time of birth have been demonstrated to be relevant to the aetiology of the major psychoses, a seasonal variation in the rates of admission of such patients has long been recognised. Few studies have compared first and readmissions. This study examined for seasonal variation of admission in the major psychoses, and compared diagnostic categories by admission status. Patients admitted to Irish psychiatric inpatient facilities between 1989 and 1994 with an ICD-9/10 diagnosis of schizophrenia or affective disorder were identified from the National Psychiatric Inpatient Reporting System (NPIRS). The data were analysed using a hierarchical log linear model, the chi-square test, a Kolmogorov-Smirnov (KS) type statistic, and the method of Walter and Elwood. The hierarchical log linear model demonstrated significant interactions between the month of admission and admission order (change in scaled deviance 28.77, df = 11, P < 0.003). Both first admissions with mania, and readmissions with bipolar affective disorder exhibited significant seasonality. In contrast, only first admissions with schizophrenia showed significant seasonal effects. Although first admissions with mania and readmissions with bipolar disorder both show seasonality, seasonal influences appear to be more relevant to onset of schizophrenia than subsequent relapse.
A review of recent studies of family interaction as a causal factor in the development of schizophrenia suggests a paucity of evidence supporting this point of view. However, research has suggested family variables may influence the course and outcome of schizophrenia. The impact of schizophrenia on the family has recently received more attention. Some research has identified differences between families of schizophrenics and the families of other diagnostic groups and controls. Whether these studies are beginning to influence the theory and practice of family therapy is discussed. Recent studies suggest the combination of long-acting medication and 'psychosocial' interventions may reduce the relapse rate of schizophrenia in the short term. This research suggests that family therapists must re-evaluate their role in the management of schizophrenia.
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