Seasonal influences on first-episode admission in affective and non-affective psychosis

Full text for this resource is not available from the Research Repository.

Hallam, Karen, Berk, Michael, Kader, Linda, Conus, Philippe, Lucas, Nellie, Hasty, Melissa, MacNeil, Craig and McGorry, Patrick D (2006) Seasonal influences on first-episode admission in affective and non-affective psychosis. Acta Neuropsychiatrica, 18 (3-4). pp. 154-161. ISSN 0924-2708


Background: Since bipolar affective disorder has been recorded, clinicians treating patients with this disorder have noted the cyclic nature of episodes, particularly an increase in mania in the spring and summer months and depression during winter. Objective: The aim of this study was to investigate seasonality in symptom onset and service admissions over a period of 10 years in a group of patients (n ¼ 359) with first-episode (FE) mania (n ¼ 133), FE schizoaffective disorder (n ¼ 49) and FE schizophrenia (n ¼ 177). Method: Patients were recruited if they were between 15 and 28 years of age and if they resided in the geographical mental health service catchment area. The number of patients experiencing symptom onset and service admission over each month and season was recorded. Results: In terms of seasonality of time of service admission, the results indicate a high overall seasonality (particularly in men), which was observed in both the schizoaffective and the bipolar groups. In terms of seasonality of symptom onset, the results indicate that seasonality remains in the male bipolar group, but other groups have no seasonal trend. Conclusions: This provides further evidence that systems mediating the entrainment of biological rhythms to the environment may be more pronounced in BPAD than in schizoaffective disorder and schizophrenia. These results may help facilitate the preparedness of mental heath services for patients at different times of the year.

Dimensions Badge

Altmetric Badge

Item type Article
DOI 10.1111/j.1601-5215.2006.00147.x
Official URL
Subjects Historical > Faculty/School/Research Centre/Department > School of Social Sciences and Psychology
Historical > FOR Classification > 1103 Clinical Sciences
Keywords ResPubID16569, biological rhythm, bipolar disorder, first episode, schizoaffective disorder, schizophrenia, seasonality
Citations in Scopus 8 - View on Scopus
Download/View statistics View download statistics for this item

Search Google Scholar

Repository staff login