Epidemiology of suicide
An estimated 1 million people worldwide take their lives by suicide every year. It is estimated that global annual suicide fatalities could rise to 1.5 million by 2020. Worldwide, suicide ranks among the three leading causes of death among those aged 15–44 years. Suicide attempts are up to 20 times more frequent than completed suicides.
Incidence of suicide in a society depends on a range of factors. Clinical depression is an especially common cause. Substance abuse, severe physical disease or infirmity are also recognized causes. The countries of the Eastern Europe and East Asia have the highest suicide rate in the world. The region with the lowest suicide rate is Latin America. Gender difference plays a significant role: among all age groups in most of the world, females tend to show higher rates of reported nonfatal suicidal behavior, males have a much higher rate of completed suicide.
In most countries the incidence of suicides is higher than the incidence of intentional homicides.
A 2006 report by the World Health Organisation (WHO) states that nearly a million people take their own lives every year, more than those murdered or killed in war. WHO figures show a suicide takes place somewhere in the world roughly every 40 seconds.
According to the National Institute of Mental Health, suicide contagion is a serious problem, especially for young people. Suicide can be facilitated in vulnerable teens by exposure to real or fictional accounts of suicide, including media coverage of suicide, such as intensive reporting of the suicide of a celebrity or idol.
Suicide rates are highest in Europe's Baltic states, where around 40 people per 100,000 die by suicide each year. The lowest rates are found mainly in Caribbean/West Indies nations and a few countries in Asia.
As many as 60,000 people commit suicide in Russia every year; approximately 30,000 people die by suicide each year in the United States; over 30,000 kill themselves in Japan; and about 250,000 commit suicide each year in China. In western countries men commit suicide at four times the rate of women. Women are more likely to attempt suicide than men.
The countries of the former Soviet Bloc and East Asia have the highest suicide rate in the world. Rate of suicide in South Korea is the highest among any other East Asian countries. The region with the lowest suicide rate is Latin America. Up to at least the 1950s, it was the Republic of Ireland which had the lowest suicide rate in the world, as reported by an Irish TV news report in 2007. China is the only country in the world where the rate of suicide by women matches that of men, with statistics even showing a slightly higher number of female cases.
Gender and suicide
In the United States, males are four times more likely to die by suicide than females, although more women than men report suicide attempts. Male suicide rates are higher than females in all age groups (the ratio varies from 3:1 to 10:1). In other western countries, males are also much more likely to die by suicide than females (usually by a factor of 3–4:1). It was the 8th leading cause of death for males, and 19th leading cause of death for females. Excess male mortality from suicide is also evident from data from non-Western countries.
Race and suicide
In 2003, in the United States, whites and Asians were nearly 2.5 times more likely to kill themselves than were blacks or Hispanics. There is a marked divergence by age as seen in the chart below. In the eastern portion of the world (primarily in Asian or Pacific-Island countries) the numbers of reported suicides is growing every year.
Sexual orientation and suicide
The likelihood of suicide attempts are increased in both gay males and lesbians, as well as bisexuals of both sexes when compared to their heterosexual counterparts. The trend of having a higher incident rate among females is no exception with lesbians or bisexual females and when compared with homosexual males, lesbians are more likely to attempt than gay or bisexual males.
Studies vary with just how increased the risk is compared to heterosexuals with a low of 0.8-1.1 times more likely for females and 1.5-2.5 times more likely for males. The highs reach 4.6 more likely in females and 14.6 more likely in males.
Race and age play a factor in the increased risk. The highest ratios for males are attributed to caucasians when they are in their youth. By the age of 25, their risk is down to less than half of what it was however black gay males risk steadily increases to 8.6 times more likely. Through a lifetime the risks are 5.7 for white and 12.8 for black gay and bisexual males.
Lesbian and bisexual females have opposite effects with less attempts in youth when compared to heterosexual females. Through a lifetime the likelihood to attempt nearly triple the youth 1.1 ratio for caucasian females, however for black females the rate is affected very little (less than 0.1 to 0.3 difference) with heterosexual black females having a slightly higher risk throughout most of the age-based study.
Gay and lesbian youth who attempt suicide are disproportionately subject to anti-gay attitudes, and have weaker skills for coping with discrimination, isolation, and loneliness, and were more likely to experience family rejection than those who do not attempt suicide. Another study found that gay and bisexual youth who attempted suicide had more feminine gender roles, adopted an LGB identity at a young age and were more likely than peers to report sexual abuse, drug abuse, and arrests for misconduct.
One study found that same-sex sexual behavior, but not homosexual attraction or homosexual identity, was significantly predictive of suicide among Norwegian adolescents. In Denmark, the age-adjusted suicide mortality risk for men in registered domestic partnerships was nearly eight times greater than for men with positive histories of heterosexual marriage and nearly twice as high for men who had never married.
Social factors and suicide
Higher levels of social and national cohesion reduce suicide rates. Suicide levels are highest among the retired, unemployed, impoverished, divorced, the childless, urbanites, empty nesters, and other people who live alone. Suicide rates also rise during times of economic uncertainty. (Although poverty is not a direct cause, it can contribute to the risk of suicide).
Epidemiological studies generally show a relationship between suicide or suicidal behaviors and socio-economic disadvantage, including limited educational achievement, homelessness, unemployment, economic dependence, and contact with the police or justice system. War is traditionally believed to be associated with a fall in suicide rates; however, this has been questioned in recent studies, showing a more complex picture than previously conceived.
Health and suicide
An unknown amount of suicide fatalities are misdiagnosed as consequences of severe illness.
The idea that suicide is more common during the winter holidays (including Christmas in the northern hemisphere) is actually a myth, generally reinforced by media coverage associating suicide with the holiday season. The National Center for Health Statistics found that suicides drop during the winter months, and peak during spring and early summer. Considering that there is a correlation between the winter season and rates of depression, there are theories that this might be accounted for by capability to commit suicide and relative cheerfulness. Suicide has also been linked to other seasonal factors.
The variation in suicides by day of week is actually greater than any seasonal variation.
Certain time trends can be related to the type of death. In the United Kingdom, for example, the steady rise in suicides from 1945 to 1962-63 was probably to some extent curtailed following the removal of carbon monoxide from domestic gas supplies which occurred with the change from coal gas to natural gas during the sixties. Methods vary across cultures, and the easy availability of lethal agents and materials plays a role.
It is estimated that global annual suicide fatalities could rise to 1.5 million by 2020. Worldwide, suicide ranks among the three leading causes of death among those aged 15–44 years. Suicide attempts are up to 20 times more frequent than completed suicides.
Suicide and body mass index
Risk of suicide may decrease with increased weight and is low in obese persons. The connection is not well understood, but it is hypothesized that elevated body weight results in higher circulating levels of tryptophan, serotonin, and leptin, which in turn reduces impulsivity.
However, other studies indicate that suicide rates increase with extreme obesity, and it is difficult to control for conflating factors such as BMI-related differences in longevity, which have a significant bearing on suicide rates.
- "Mortality and Burden of Disease Estimates for WHO Member States in 2002" (XLS). World Health Organization. 2002. Retrieved 2009-12-13.
- "Suicide prevention". WHO Sites: Mental Health. World Health Organization. February 16, 2006. Retrieved 2006-04-11.
- Staff (2002). "Self-directed violence" (PDF). World Health Organization. Retrieved 2006-04-11.
- Staff (December 1999). "Frequently Asked Questions about Suicide". NIMH: Suicide Prevention. National Institute of Mental Health (United States). Retrieved 2006-04-11.
- Table of WHO suicide rates by gender as of December 2005.
- WHO country reports and charts for suicide rates retrieved June 6, 2006.
- 60,000 people commit suicide in Russia annually
- Suicide, Facts
- "Suicides in Japan top 30,000 for 9th straight year". Yahoo!.
- 250,000 Chinese Kill Themselves Annually: Official
- "The Numbers Count: Mental Disorders in America — Suicide". National Institute of Mental Health. Retrieved 2007-12-11.
- More killed by suicide than war
- "Teen Suicide Statistics". Adolescent Teenage Suicide Prevention. FamilyFirstAid.org. 2001. Retrieved 2006-04-11.
- Hoyert, Donna; Heron, Melonie P.; Murphy, Sherry L.; Kung, Hsiang-Ching (2006-04-19). "Deaths: Final Data for 2003" (PDF). National Vital Statistics Report (U.S. Department of Health and Human Services) 54 (13). Retrieved 2006-07-22.
- "Epidemiology of Suicide", Behind Asia's Epidemic (Marten Publications), 2008
- Westefeld, John; Maples, Michael; Buford, Brian; Taylor, Steve (2001). "Gay, Lesbian, and Bisexual College Students". Journal of College Student Psychotherapy 15 (3): 71–82. doi:10.1300/J035v15n03_06.
- Fergusson DM, Horwood LJ, Ridder EM, Beautrais AL (July 2005). "Sexual orientation and mental health in a birth cohort of young adults". Psychological Medicine 35 (7): 971–81. doi:10.1017/S0033291704004222. PMID 16045064.
- Silenzio VM, Pena JB, Duberstein PR, Cerel J, Knox KL (November 2007). "Sexual Orientation and Risk Factors for Suicidal Ideation and Suicide Attempts Among Adolescents and Young Adults". American Journal of Public Health 97 (11): 2017–9. doi:10.2105/AJPH.2006.095943. PMC 2040383. PMID 17901445.
- Gay, Lesbian, Bisexual & Transgender "Attempted Suicide" Incidences/Risks Suicidality Studies From 1970 to 2009
- Bell & Weinberg (1978): Tables 21.14 & 21.15, pages 453-454.
- Safren SA, Heimberg RG (December 1999). "Depression, hopelessness, suicidality, and related factors in sexual minority and heterosexual adolescents". Journal of Consulting and Clinical Psychology 67 (6): 859–66. doi:10.1037/0022-006X.67.6.859. PMID 10596508.
- Russell ST, Joyner K (August 2001). "Adolescent Sexual Orientation and Suicide Risk: Evidence From a National Study". American Journal of Public Health 91 (8): 1276–81. doi:10.2105/AJPH.91.8.1276. PMC 1446760. PMID 11499118.
- Saghir MT, Robins E, Walbran B, Gentry KA (August 1970). "Homosexuality. IV. Psychiatric disorders and disability in the female homosexual". The American Journal of Psychiatry 127 (2): 147–54. PMID 5473144.
- ed. Sandfort, T; et al. Lesbian and Gay Studies: An Introductory, Interdisciplinary Approach. Chapter 2.
- Rotheram-Boris, et al. (1994); Proctor and Groze (1994)
- Ryan C, Huebner D, Diaz RM, Sanchez J (January 2009). "Family rejection as a predictor of negative health outcomes in white and Latino lesbian, gay, and bisexual young adults". Pediatrics 123 (1): 346–52. doi:10.1542/peds.2007-3524. PMID 19117902.
- Remafedi G, Farrow JA, Deisher RW (June 1991). "Risk factors for attempted suicide in gay and bisexual youth". Pediatrics 87 (6): 869–75. PMID 2034492.
- Wichstrøm L, Hegna K (February 2003). "Sexual orientation and suicide attempt: a longitudinal study of the general Norwegian adolescent population". Journal of Abnormal Psychology 112 (1): 144–51. doi:10.1037/0021-843X.112.1.144. PMID 12653422.
- Mathy RM, Cochran SD, Olsen J, Mays VM (December 2009). "The association between relationship markers of sexual orientation and suicide: Denmark, 1990–2001". Soc Psychiatry Psychiatr Epidemiol 46 (2): 111–7. doi:10.1007/s00127-009-0177-3. PMC 3034881. PMID 20033129.
- Diego De Leo & Russell Evans (Griffith University) (2003). "International Suicide Rates: Recent Trends and Implications for Australia" (PDF). Australian Institute for Suicide Research and Prevention. Retrieved 2008-08-29.
- Changes in Scottish suicide rates during the Second World War. Rob Henderson, Cameron Stark, Roger W Humphry, Sivasubramaniam Selvaraj; BMC Public Health 2006, 6:167 doi:10.1186/1471-2458-6-167. http://www.biomedcentral.com/1471-2458/6/167
- Suicide and the war in Croatia. A. Bosnar, V. Stemberga, M. Coklo, G. Zamolo Koncar, M. Definis-Gojanovic, V. Sendula-Jengic, P. Katic; Forensic Science Int, Volume 147, Supplement, Pages S13-S16 (17 January 2005), doi:10.1016/j.forsciint.2004.09.086. http://www.fsijournal.org/article/S0379-0738(04)00600-0/abstract
- NPR: Study: Suicides Drop During Holidays
- See Seasonal affective disorder
- "lack the ability to organize their own death. Later,..."
- See section on "Season"
- Study carried out by the Finnish National Public Health Institute
-  NBC News article referencing a study published in Social Psychiatry and Psychiatric Epidemiology
- Kreitman, N. (1976). "The coal gas story. United Kingdom suicide rates, 1960-71". British Journal of Preventive and Social Medicine 30 (2): 86–93. doi:10.2307/25565893. JSTOR 25565893. PMC 478945. PMID 953381.
- Staff (February 16, 2006). "SUPRE". WHO sites: Mental Health. World Health Organization. Retrieved 2006-04-11.
- Mukamal KJ, Rimm EB, Kawachi I, O'Reilly EJ, Calle EE, Miller M (November 2009). "Body Mass Index and Risk of Suicide Among One Million US Adults". Epidemiology 21 (1): 82–6. doi:10.1097/EDE.0b013e3181c1fa2d. PMID 19907331.
- Ottar Bjerkeset, Pål Romundstad, Jonathan Evans, David Gunnell (2008). "Association of Adult Body Mass Index and Height with Anxiety, Depression, and Suicide in the General Population". Am. J. Epidemiol. 167 (2): 193–202. doi:10.1093/aje/kwm280. PMID 17981889.
- Wagner, B. "Extreme obesity is associated with suicidal behavior and suicide attempts in adults: results of a population-based representative sample". Depression and Anxiety. Wiley Periodicals, Inc. Retrieved Dec 23, 2013.