Cross-sectional and within-subject seasonality and regularity of hospitalizations: A population study in mood disorders and schizophrenia

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11120%2F20%3A43919699" target="_blank" >RIV/00216208:11120/20:43919699 - isvavai.cz</a>

Alternative codes found

RIV/00023752:_____/20:43920158

Result on the web

<a href="https://doi.org/10.1111/bdi.12884" target="_blank" >https://doi.org/10.1111/bdi.12884</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/bdi.12884" target="_blank" >10.1111/bdi.12884</a>

Result language

angličtina

Original language name

Cross-sectional and within-subject seasonality and regularity of hospitalizations: A population study in mood disorders and schizophrenia

Original language description

Background: Seasonal peaks in hospitalizations for mood disorders and schizophrenia are well recognized and often replicated. The within-subject tendency to experience illness episodes in the same season, that is, seasonal course, is much less established, as certain individuals may temporarily meet criteria for seasonal course purely by chance. Aims: In this population, prospective cohort study, we investigated whether between and within-subject seasonal patterns of hospitalizations occurred more frequently than would be expected by chance. Methods: Using a compulsory, standardized national register of hospitalizations, we analyzed all admissions for mood disorders and schizophrenia in the Czech Republic between 1994 and 2013. We used bootstrap tests to compare the observed numbers of (a) participants with seasonal/regular course and (b) hospitalizations in individual months against empirical distributions obtained by simulations. Results: Among 87 184 participants, we found uneven distribution of hospitalizations, with hospitalization peaks for depression in April and November (X2(11) = 363.66, P &lt;.001), for mania in August (X2(11) = 50.36, P &lt;.001) and for schizophrenia in June (X2(11) = 70.34, P &lt;.001). Significantly more participants than would be expected by chance, had two subsequent rehospitalizations in the same 90 days in different years (7.36%, bootstrap P &lt;.01) or after a regular, but non-seasonal interval (6.07%, bootstrap P &lt;.001). The proportion of participants with two consecutive hospitalizations in the same season was below chance level (7.06%). Conclusions: Psychiatric hospitalizations were unevenly distributed throughout the year (cross-sectional seasonality), with evidence for regularity, but not seasonality of hospitalizations within subjects. Our data do not support the validity of seasonal pattern specifier. Season may be a general risk factor, which increases the risk of hospitalizations across psychiatric participants.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

30215 - Psychiatry

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Bipolar Disorders

ISSN

1398-5647

e-ISSN

—

Volume of the periodical

22

Issue of the periodical within the volume

5

Country of publishing house

US - UNITED STATES

Number of pages

9

Pages from-to

508-516

UT code for WoS article

000508591300001

EID of the result in the Scopus database

2-s2.0-85078680768