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Reduction in the suicide rate during Advent--a time series analysis
Vladeta Ajdacic-Gross1, Christoph Lauber, Matthias Bopp
1Research Unit for Clinical and Social Psychiatry, Psychiatric University Hospital, P.O. Box 1930, CH-8021 Zurich, Switzerland. vajdacic@spd.unizh.ch
Psychiatry Research
|November 3, 2007
Summary
The study reveals a distinct seasonal pattern in suicide rates, with a significant decrease extending through the final weeks of the year, particularly during Advent and Christmas. This seasonal suicide trend presents unique challenges for prevention efforts.
Area of Science:
- Psychiatry
- Epidemiology
- Public Health
Background:
- Seasonal variations in suicide rates are documented, but specific patterns require further investigation.
- Understanding these patterns is crucial for effective suicide prevention strategies.
Purpose of the Study:
- To demonstrate that the year-end decrease in suicide rates constitutes a specific seasonal effect, extending over the final weeks of the year.
- To analyze the temporal dynamics of this seasonal suicide pattern.
Main Methods:
- Utilized daily suicide frequency data from Swiss mortality statistics (1969-2003).
- Employed time-series analysis, specifically the Box-Jenkins approach with intervention models, focusing on the October-February period.
- Incorporated a step function to model the gradual decline in suicide rates during December.
Main Results:
- A significant decrease in suicide frequency was observed throughout Advent and accentuated at Christmas.
- Following New Year's Day, a sharp recovery in suicide rates was noted for men, but not for women.
- The year-end reduction in suicide rates surpassed the effect typically seen on major public holidays.
Conclusions:
- The end-of-year decrease in suicide rates represents a specific, prolonged seasonal effect.
- This pattern highlights the need for carefully timed suicide prevention campaigns and enhanced social network support during this period.
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