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Question: What is the prevalence of non-fatal suicidal behaviours among US adolescents and what is their association with mental health disorders?
Population: About 6483 adolescents aged 13–18 years and their parents taking part in the National Comorbidity Survey Replication Adolescent Supplement (NSC-A).
Setting: USA; years of study not reported.
Assessment: Data were collected through face-to-face household interviews with adolescents, and parent-completed questionnaires. Non-fatal suicidal behaviours were assessed using a modified suicidal behaviour module of the Composite International Diagnostic Interview (CIDI), which assesses lifetime occurrence of suicidal ideation and age of onset. Among those reporting ideation, suicide plans and attempts were assessed. Diagnoses of mental health disorders were derived using data from a modified version of CIDI, developed for adolescents and administered by trained lay interviewers.
Outcomes: Lifetime prevalence of suicidal ideation, plans and attempts. Assessment was made of the association between suicide behaviours and mental health disorders, which were categorised as fear and anger disorders (specific) phobia, panic disorder/agoraphobia, social phobia, intermittent explosive disorder; distress disorders (separation anxiety disorder, post-traumatic stress disorder, major depressive disorder and/or dysthymia (MDD/DYS)and generalised anxiety disorder; disruptive behaviour disorders (attention-deficit-hyperactivity disorder (ADHD), oppositional defiant disorder (ODD), conduct disorder and eating disorders (including anorexia nervosa, bulimia nervosa and binge eating disorder)); and substance abuse (alcohol and illicit drug abuse). Bipolar disorder was also assessed during the CIDI interview. Parent and adolescent reports were combined to derive Diagnostic and Statistical Manual of Mental Disorders, fourth edition (DSM-IV) diagnoses for four disorders (MDD/DYS, ADHD, ODD and conduct disorder).
Design: Cross-sectional study.
Overall, lifetime prevalence of suicidal ideation was 12.1%; suicide plans, 4%; and suicide attempts, 4.1%. A third of those with suicidal ideation (33.4%) had made a plan and a third (33.9%) had attempted suicide. Among those who had made a plan, 60.8% attempted suicide; meanwhile 20.4% of those with ideation but without a plan had made an attempt. The majority of adolescents with a history of suicidal behaviour met the criteria for at least one mental health disorder. Disorder prevalence generally increased with severity of suicidal behaviour (prevalence of any disorder among those with ideation was 89.3%, among planners was 93.6% and among attempters was 96.1%). See the WebExtra table 1 for prevalence of mental health disorders by suicidal behaviours.
Approximately 12% of US adolescents report of having seriously thought about suicide at some point during their life. Among teens reporting suicidal ideation, 33% developed a plan to commit suicide and 60% of those with a plan go on to attempt suicide. Mental health disorders increase with increasing severity of suicidal behaviour.
The adolescent supplement to the National Comorbidity Survey Replication (NCS-R) is the largest adolescent mental health survey conducted to date. Epidemiological studies have great potential to elucidate risk factors because adolescent suicide is exceptionally rare, occurring at a base rate of <0.001% in the population. Moreover, in spite of notable public health efforts, we are no nearer to identifying the 0.001% and preventing untimely death. Nock and colleagues examine suicide thoughts, plans and attempts in a sample large enough to understand these risk behaviours.
Nock and colleagues are the first to report how often and how quickly adolescents transition among suicide thoughts, plans, and attempts. They also report that over half of the suicidal adolescents began mental health treatment before the onset of suicidality. Thus, for many youth, professional intervention did not prevent suicide risk. The odds of suicidality were also elevated for nearly every psychiatric condition, suggesting that providers should assess risk, regardless of diagnosis.
Youth suicide is preventable and devastating. Although epidemiological designs have the potential to identify those at highest risk, this requires the right questions be asked of participants. As is often the case with large surveys, the NCS-R falls short of this goal. The survey neglected to assess non-suicidal self-injury, which predicts suicide and is highly prevalent among adolescents. In addition, many risk, vulnerability and protective factors are not included in diagnostic interviews (eg, interpersonal relationships, current plans and access to means). Our knowledge base is now sophisticated enough to design epidemiological studies specific to suicide. A handful of questions will no longer suffice.
In the meantime, mental health practitioners and scholars cannot relegate suicide assessment, research or prevention to those who study and treat depression. Suicide is not a symptom, but a health problem in its own right. The results of this study are plain. Adolescents with psychopathology are at heightened risk, and therapy may not reliably change this. Indeed, reducing suicidality has proven difficult in clinical trials. Future research should examine how often mental health professionals fail to even ask ‘Have you ever harmed yourself on purpose or thought about doing so?’
This web only file has been produced by the BMJ Publishing Group from an electronic file supplied by the author(s) and has not been edited for content.
Files in this Data Supplement:
- Data supplement 1 - Online table
Sources of funding: US National Institute of Mental Health, National Institute on Drug Abuse, the Substance Abuse and Mental Health Services Administration, the Robert Wood Johnson Foundation and the John W. Alden Trust.
Competing interests None.
Funding Time spent writing this commentary was supported by grant PRG-0-104-11 from the American Foundation for Suicide Prevention to Sheila E Crowell, PhD.
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