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BMC Public Health. 2012; 12: 505.
Published online Jul 6, 2012. doi:  10.1186/1471-2458-12-505
PMCID: PMC3443008
Temporal patterns of charcoal burning suicides among the working age population in Hong Kong SAR: the influence of economic activity status and sex
Chi-kin Lawcorresponding author1,2 and Candi MC Leung3
1Hong Kong Institute of Asia-Pacific Studies, The Chinese University of Hong Kong, Shatin, Hong Kong
2Australian Institute for Suicide Research and Prevention, Griffith University, Griffith, Australia
3Department of Psychology, The University of Hong Kong, Pokfulam, Hong Kong
corresponding authorCorresponding author.
Chi-kin Law: lawckin1/at/gmail.com; Candi MC Leung: candylmc/at/gmail.com
Received November 27, 2011; Accepted June 26, 2012.
Abstract
Background
Charcoal burning in a sealed room has recently emerged as the second most common suicide means in Hong Kong, causing approximately 200 deaths each year. As charcoal burning suicide victims have a unique sociodemographic profile (i.e., predominantly economically active men), they may commit suicide at specific times. However, little is known about the temporal patterns of charcoal burning suicides.
Methods
Suicide data from 2001 to 2008 on victims of usual working age (20–59) were obtained from the registered death files of the Census and Statistics Department of Hong Kong. A total of 1649 cases of charcoal burning suicide were analyzed using a two-step procedure, which first examined the temporal asymmetries in the incidence of suicide, and second investigated whether these asymmetries were influenced by sex and/or economic activity status. Poisson regression analyses were employed to model the monthly and daily patterns of suicide by economic activity status and sex.
Results
Our findings revealed pronounced monthly and daily temporal variations in the pattern of charcoal burning suicides in Hong Kong. Consistent with previous findings on overall suicide deaths, there was an overall spring peak in April, and Monday was the common high risk day for all groups. Although sex determined the pattern of variation in charcoal burning suicides, the magnitude of the variation was influenced by the economic activity status of the victims.
Conclusion
The traditional classification of suicide methods as either violent or nonviolent tends to elide the temporal variations of specific methods. The interaction between sex and economic activity status observed in the present study indicates that sex should be taken into consideration when investigating the influence of economic activity status on temporal variations of suicide. This finding also suggests that suicide prevention efforts should be both time- and subgroup-specific.
Keywords: Temporal variation, charcoal burning, suicide prevention, time pattern, seasonal risk
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