Context Suicide is a leading cause of death in the United States, but identifying
persons at risk is difficult. Thus, the US surgeon general has made suicide
prevention a national priority. An expanding body of research suggests that
childhood trauma and adverse experiences can lead to a variety of negative
health outcomes, including attempted suicide among adolescents and adults.Objective To examine the relationship between the risk of suicide attempts and
adverse childhood experiences and the number of such experiences (adverse
childhood experiences [ACE] score).Design, Setting, and Participants A retrospective cohort study of 17 337 adult health maintenance
organization members (54% female; mean [SD] age, 57 [15.3] years) who attended
a primary care clinic in San Diego, Calif, within a 3-year period (1995-1997)
and completed a survey about childhood abuse and household dysfunction, suicide
attempts (including age at first attempt), and multiple other health-related
issues.Main Outcome Measure Self-reported suicide attempts, compared by number of adverse childhood
experiences, including emotional, physical, and sexual abuse; household substance
abuse, mental illness, and incarceration; and parental domestic violence,
separation, or divorce.Results The lifetime prevalence of having at least 1 suicide attempt was 3.8%.
Adverse childhood experiences in any category increased the risk of attempted
suicide 2- to 5-fold. The ACE score had a strong, graded relationship to attempted
suicide during childhood/adolescence and adulthood (P<.001).
Compared with persons with no such experiences (prevalence of attempted suicide,
1.1%), the adjusted odds ratio of ever attempting suicide among persons with
7 or more experiences (35.2%) was 31.1 (95% confidence interval, 20.6-47.1).
Adjustment for illicit drug use, depressed affect, and self-reported alcoholism
reduced the strength of the relationship between the ACE score and suicide
attempts, suggesting partial mediation of the adverse childhood experience–suicide
attempt relationship by these factors. The population-attributable risk fractions
for 1 or more experiences were 67%, 64%, and 80% for lifetime, adult, and
childhood/adolescent suicide attempts, respectively.Conclusions A powerful graded relationship exists between adverse childhood experiences
and risk of attempted suicide throughout the life span. Alcoholism, depressed
affect, and illicit drug use, which are strongly associated with such experiences,
appear to partially mediate this relationship. Because estimates of the attributable
risk fraction caused by these experiences were large, prevention of these
experiences and the treatment of persons affected by them may lead to progress
in suicide prevention.