Seasonality of suicide: a multi-country multi-community observational study.

Yu, J; Yang, D; Kim, Y; Hashizume, M; Gasparrini, A; Armstrong, B; Honda, Y; Tobias, A; Sera, F; Vicedo-Cabrera, A. M.; Kim, H; Íñiguez, C; Lavigne, E; Ragettli, M S; Scovronick, N; Acquaotta, F; Chen, B; Guo, Y L; de Sousa Zanotti Stagliori Coelho, M; Saldiva, P; ... (2020). Seasonality of suicide: a multi-country multi-community observational study. Epidemiology and psychiatric sciences, 29, e163. 10.1017/S2045796020000748

[img]
Preview
Text
Yu EpidemiolPsychiatrSci 2020.pdf - Published Version
Available under License Creative Commons: Attribution (CC-BY).

Download (794kB) | Preview

AIMS

We aimed to investigate the heterogeneity of seasonal suicide patterns among multiple geographically, demographically and socioeconomically diverse populations.

METHODS

Weekly time-series data of suicide counts for 354 communities in 12 countries during 1986-2016 were analysed. Two-stage analysis was performed. In the first stage, a generalised linear model, including cyclic splines, was used to estimate seasonal patterns of suicide for each community. In the second stage, the community-specific seasonal patterns were combined for each country using meta-regression. In addition, the community-specific seasonal patterns were regressed onto community-level socioeconomic, demographic and environmental indicators using meta-regression.

RESULTS

We observed seasonal patterns in suicide, with the counts peaking in spring and declining to a trough in winter in most of the countries. However, the shape of seasonal patterns varied among countries from bimodal to unimodal seasonality. The amplitude of seasonal patterns (i.e. the peak/trough relative risk) also varied from 1.47 (95% confidence interval [CI]: 1.33-1.62) to 1.05 (95% CI: 1.01-1.1) among 12 countries. The subgroup difference in the seasonal pattern also varied over countries. In some countries, larger amplitude was shown for females and for the elderly population (≥65 years of age) than for males and for younger people, respectively. The subperiod difference also varied; some countries showed increasing seasonality while others showed a decrease or little change. Finally, the amplitude was larger for communities with colder climates, higher proportions of elderly people and lower unemployment rates (p-values < 0.05).

CONCLUSIONS

Despite the common features of a spring peak and a winter trough, seasonal suicide patterns were largely heterogeneous in shape, amplitude, subgroup differences and temporal changes among different populations, as influenced by climate, demographic and socioeconomic conditions. Our findings may help elucidate the underlying mechanisms of seasonal suicide patterns and aid in improving the design of population-specific suicide prevention programmes based on these patterns.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Social and Preventive Medicine (ISPM)

UniBE Contributor:

Vicedo Cabrera, Ana Maria

Subjects:

600 Technology > 610 Medicine & health
300 Social sciences, sociology & anthropology > 360 Social problems & social services

ISSN:

2045-7960

Language:

English

Submitter:

Andrea Flükiger-Flückiger

Date Deposited:

01 Sep 2020 17:50

Last Modified:

08 Sep 2020 14:55

Publisher DOI:

10.1017/S2045796020000748

PubMed ID:

32829741

Uncontrolled Keywords:

Climate heterogeneity seasonality socioeconomic suicide

BORIS DOI:

10.7892/boris.146266

URI:

https://boris.unibe.ch/id/eprint/146266

Actions (login required)

Edit item Edit item
Provide Feedback