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Effective strategies for suicide prevention in New
Zealand: a review of the evidence
Annette Beautrais, David Fergusson, Carolyn Coggan,
Catherine Collings, Carolyn Doughty, Pete Ellis, Simon Hatcher, John
Horwood, Sally Merry, Roger Mulder, Richie Poulton, Lois Surgenor
This paper has been prepared by members of the Suicide
Research Network (SRN). The SRN is an informal network of research workers in
the area of suicide and psychiatry who have come together to produce evidence
based expert consensus on matters relating to suicidal behaviours in New
Zealand. In this paper we present a review of the international evidence on
suicide prevention. We see this paper as providing the empirical foundations for
the development of suicide prevention policies in New Zealand.
A national suicide prevention strategy for New Zealand was
developed in 2006. This paper provides a conceptual framework for classifying
suicide prevention initiatives, reviews evidence for their effectiveness, and
makes recommendations for initiatives to be undertaken as part of suicide
prevention activities in New Zealand.
There is relatively little strong evidence for the efficacy
of many existing suicide prevention initiatives, and this area has frequently
been captured by strong claims about the effectiveness of programmes that have
not been adequately evaluated.
While a recent paper reviewed subject areas of suicide
prevention,1 we attempt to expand this
information and place suicide prevention activities in New Zealand on the best
possible evidence base by using a four-fold classification of suicide prevention
initiatives based on an evidence hierarchy:
Outcome measuresSuicide has a low base rate which leads to problems in
relying upon reductions in suicide alone as evidence of effectiveness. In this
review we have included programmes in which outcomes included reductions in
suicide, suicide attempt, suicidal ideation, and other appropriate measures.
Outcome measures are described for each programme discussed.
SourcesUsing the classification derived above a selective review
(based upon the authors’ familiarity with the field) was conducted of a
number of major books, journal articles, reviews, summaries, and reports on
programmes and initiatives in the area of suicide prevention. This review
yielded the following results:
Initiatives for which strong evidence of effectiveness existsThere are three areas in which strong evidence of
effectiveness exists1:
Training for medical
practitioners—Providing medical practitioners in primary care
with training to enable them to better recognise and treat depression has been
shown to result in improved treatment of patients with depression and in lower
suicide rates.2 This approach is based on
knowledge that, often, depression is under-recognised and inadequately
treated,3 and that, in many countries, those
who die by suicide see a medical practitioner in the weeks before their
death.4 Further, a range of quality improvement
initiatives, collaborative care programmes and nurse case management programmes
in primary care settings have been shown to improve identification and
management of depression.5 This approach also
needs to be extended to enhance physician detection and treatment of, not only
depression, but other mental illnesses, including substance use disorders, that
increase risk of suicidal behaviour.
Restriction of (suicide)
methods—Evidence from several countries, including New Zealand,
suggests that reducing access to particular means of suicide reduces the rate of
suicide by that method, and sometimes (if the specific method accounts for a
majority of suicides) can reduce total suicide rates. Findings in this area span
a range of different methods including reducing access to domestic
gas,6 various forms of legislative restriction
on gun possession and control,7 reducing carbon
monoxide emissions from vehicles,8 restricting
availability of pesticides,9 reducing the pack
size of analgesics,10 installing barriers at
sites that become popular for suicide,11
various restrictions on prescribing drugs which are toxic in
overdose,12 and prescribing drugs which have
relatively low lethality if taken in
overdose.13
Gatekeeper education—Programmes which
focus on enhancing the skills of community, organisational, and institutional
gatekeepers (including clergy; and those who work in schools, prisons, juvenile
detention and welfare centres, workplaces, and homes for the elderly) can
improve identification and referral of people at risk of suicidal behaviour.
An example is provided by the United States Air Force
Suicide Prevention programme which reduced suicides amongst Air Force
personnel.14 This integrated programme focused
on a series of approaches which included encouraging early mental health
intervention, promoting help seeking, destigmatising mental health problems, and
increasing protective factors such as social connectedness and social support
and improving coping skills. The programme focused not only on suicidal
behaviour but also on domestic violence and substance abuse which were regarded
as indicators of stress and distress. Many similar programmes have been
developed in various institutions. Few have been evaluated.
We need to encourage evaluation and refinement of existing
programmes, development of new programmes, and specific evaluations to learn
more about the effective components of gatekeeper education programmes.
Initiatives that appear promisingIn contrast to the paucity of programmes for which strong
evidence of efficacy exists, a growing number of studies suggest promising
results in various areas. These include:
Providing support after suicide
attempts—People who make suicide attempts are at increased risk
of making further attempts, and of dying by
suicide.15 A small number of interventions
which focus on enhancing treatment and support for these people have been shown
to reduce the risk of repeated suicidal behaviour. A Norwegian initiative which
focused on providing follow-up care to people discharged from hospital after
making suicide attempts via an integrated chain-of-care network was shown to be
effective in reducing further suicide attempts and in maintaining adherence to
treatment regimes.16
Relatively simple interventions (sending letters to people
after discharge following admission for self-poisoning; providing a ‘green
card’ for emergency access to mental health services; employing
counsellors to co-ordinate follow-up services for people who made suicide
attempts) have been successful in reducing further suicide attempts and
suicide.17,18
These findings suggest there may be a range of minimal cost,
but effective, interventions which can be developed to provide follow-up care
and support for suicide attempt patients, both in the immediate aftermath of a
suicide attempt, and in the longer term, since many of these patients will have
chronic mental health problems.
Pharmacotherapy for mental
illness—Given the high prevalence of mental illness in those who
die by suicide, treating mental illness effectively and providing long-term
mental health care and support are major approaches to preventing suicide. Some
treatments for specific mental illnesses have been shown to reduce suicidal
behaviour. These include long-term therapy with lithium for people with bipolar
disorder or severe depression,19 and the use of
the antipsychotic medications clozapine and olanzapine by people with psychotic
illnesses, including schizophrenia.20
Randomised Controlled Trials (RCTs) of antidepressant
therapy (versus placebo) show significant reductions in suicidal
ideation.21,22 Patient population studies show
reduced suicide attempt rates in adults treated with
antidepressants23 and in adolescents treated
with antidepressants for 6 months rather than for 2 months or
less.24
Population-based studies suggest that the recent widespread
introduction and use of the class of antidepressants known as selective
serotonin reuptake inhibitors (SSRIs) has been associated with decreased suicide
rates.25-27 For example, in 27 countries, the
most marked reductions in suicide rates were observed in those that had the
largest increase in SSRI prescribing rates.27
However, there are conflicting interpretations of these data, with suggestions
that suicide rates began to decline prior to the widespread availability of
antidepressants.28,29
Recent controversy regarding reported adverse events in
clinical trials of SSRIs for children and
adolescents30 led to the US Food and Drug
Administration (FDA) recommending that a ‘black box’ warning be
added to the health professional labelling of all antidepressant medications to
describe an increased risk of suicidal thoughts and behaviour in children and
adolescents, and perhaps adults, being treated with antidepressant
medications.31-34 There are concerns that these
warnings may lead to decreased use of these medications in depressed patients,
and that this, in turn, may influence suicide rates.
There is a need to weigh concerns about possible adverse
events with the fact that most depressed people who die by suicide are not
receiving treatment. More generally there is a need for better designed
evaluations of antidepressants using RCTs to explore how effective
antidepressants are in reducing suicidal behaviour in people with depression and
with comorbid anxiety and depression.
Psychotherapy and psychosocial interventions for
mental illness—Several psychological therapies and approaches
have been shown to reduce suicidal behaviour, hopelessness and depressive
symptoms, and to increase compliance with treatment, when compared with
treatment as usual.35,36 These therapies
include cognitive behavioural therapy (CBT), interpersonal behavioural therapy
(IPT), dialectical behavioural therapy (DBT), and some forms of problem-solving
therapy (PST).35 An example is provided by a
10-session cognitive therapy intervention provided to adults who had recently
attempted suicide. Compared to treatment as usual, this intervention led to
significantly lower reattempt rates, less hopelessness, and less severe
self-reported depression, but to no change in suicidal
ideation.37
Psychosocial interventions that reduce suicidal behaviour
include psychoanalytically informed partial hospitalisation, programmes which
involve intensive care plus outreach, postal mailings and provision of
‘green cards’ to people who had made suicide
attempts.17,18,35,38-40
In young people with psychiatric crises, Multi Systemic
Therapy (MST) has been shown to be more effective than emergency hospitalisation
in decreasing rates of suicide attempt in the following
year.41. A psycho-educational social network
intervention with psychiatrically hospitalised, suicidal young people found
significantly less suicidal ideation and parental reports of less functional
impairment related to depression.42
Such studies provide evidence that psychological and
psychosocial therapies can reduce suicidal behaviour either alone or in
combination with medication. Further research is needed to explore what
combinations of psychopharmacological, psychological and psychosocial
interventions are most effective in reducing suicidal behaviour. Evaluations
should include assessment of efficacy, effectiveness and
cost-effectiveness.
Public awareness education and mental health
literacy—Improving public knowledge, or literacy, about mental
health and suicidal behaviour is an important public health goal in its own
right, and may contribute to suicide prevention by changing public recognition
and attitudes towards mental illnesses 43. For
example, programmes which aim to increase public awareness and understanding of
depression may lead to better recognition, treatment seeking and support for
those with depression. However, while it appears relatively easy to change
attitudes with depression awareness programmes it appears more difficult to
translate attitudinal changes into behavioural changes which are reflected in
increased treatment seeking or use of
antidepressants.44
There is some evidence that generic population-based
programmes are largely ineffective and that a more effective approach is to
target more modest programmes to clearly defined specific sub-groups
45.
Screening for depression and suicide
risk—A series of programmes have been developed that screen
directly for suicide risk or for the mental illnesses, such as depression or
substance abuse, which are known to increase suicide risk. These programmes have
typically been used in schools or universities, or in primary care
settings.46-48
An example is provided by the US College Screening Project
in which college students are invited to complete a brief screening
questionnaire for psychiatric illness. Students whose responses suggest problems
are invited to come to the college counselling centre for face to face
assessment and treatment.47 While such
programmes appear promising, they need further evaluation to determine their
cost-effectiveness and to identify and refine the tools for screening which best
discriminate between those at risk and those not at risk.
Crisis centres and crisis
counselling—Based on the premise that most people contemplating
suicide are ambivalent, crisis centres and telephone help lines offer crisis
counselling to callers, and encourage them to seek assessment and treatment from
mental health services. Despite their popularity, few such centres and help
lines have been evaluated.49-51 A recent
evaluation of telephone help lines in the United States found that some callers
are helped, but not all help lines offered high quality
assistance.52 Increasingly, similar crisis
services are being provided via the internet and by text messaging on mobile
phones. Such services require evaluation to ensure that services delivered in
these ways are safe and effective.
School-based competency promoting and skill
enhancing programmes—To overcome some of the problems posed by
didactic suicide awareness programmes in schools (see below), a series of
skill-enhancing, competency-promoting programmes have been introduced as
alternatives. These programmes are based on the premise that enhancing
self-esteem, and coping and problem solving skills, may protect vulnerable young
people against adverse outcomes including suicidal behaviour. Evaluations of
these programmes tend to find that improving these types of skills enhances the
factors that are thought to protect against suicide, and some programmes have
been associated with reduced suicidal behaviours among
students.53
Encouragement of responsible media coverage of
suicide—Media coverage of suicide has the potential to
precipitate suicidal behaviour in vulnerable
people.54 This evidence has led many countries,
including New Zealand, to develop media guidelines for reporting and portraying
suicide.55,56 There are few evaluations of
these guidelines, and there is a need to assess the impact of these guidelines
on both reporting practices and suicide rates. A related issue which also
requires evaluation is how to best develop and implement media guidelines to
encourage adherence by media personnel.57
In the meantime there is much that can be done to promote
responsible and informed media coverage of suicide by maintaining, implementing
and promoting the use of existing media resources. Another way forward is to
find ways of working collaboratively with media to disseminate factual, accurate
evidence and information about suicide and mental health in a non-stigmatising
manner and to promote knowledge and information about suicide prevention.
Support for family, whānau (extended family),
and friends bereaved by suicide—Rates of suicidal behaviour are
elevated 2–6 fold in family members of those who die by suicide or make
suicide attempts.58 Providing support to
families, whānau, friends and others bereaved by suicide may prevent
suicidal behaviour in this vulnerable population. However, there is relatively
little evidence from controlled trials about the types of programmes which are
likely to be effective in this context.
There is some promising evidence for the following
programmes:
Further, there is a need to develop and evaluate a
range of interventions designed to support various populations of people
bereaved by suicide, and to assess effectiveness using a range of outcome
measures.
Initiatives for which no evidence of effectiveness exists but which may be beneficial in suicide preventionA broad spectrum of population-based initiatives focus on
increasing population mental health and wellbeing. While the direct contribution
of these programmes to reducing suicide rates has not been evaluated they may,
nonetheless, make a contribution to suicide reduction by encouraging a positive
social climate that minimises risks of mental health and psycho-social problems
and maximises the opportunities for more targeted suicide prevention activities
to succeed. These programmes include:
Improving control of alcohol—National
or state strategies which seek to improve control of alcohol may have the added
benefit of reducing suicidal behaviour by decreasing the risk of acute alcohol
intoxication (which is associated with impulsive suicide attempts), and by
reducing the fraction of the population with alcohol-use disorders, which are
precursors of suicide attempts.62 Indeed,
suicide rates in both Iceland and the former USSR decreased following the
introduction of strong national anti-alcohol
policies.63,64
Community-based mental health services and support
services—Community based mental health teams are now accepted as
the appropriate setting for treating people with severe mental illness, and the
development of these multidisciplinary teams has been national policy in many
countries for decades.65 These teams have been
subjected to relatively sparse evaluation, but have been shown to be associated
with fewer suicide deaths, less dissatisfaction with care, less drop out from
treatment and with overall much lower cost than inpatient
care.66
Areas in which community based care strategies are likely to
be effective include: establishing the care, treatment and management of
suicidal patients as a core curriculum component in psychiatric and general
practitioner training programmes; encouraging integration between services for
those requiring mental health care; establishing clear protocols for assessment,
treatment and follow-up of those who present at emergency departments with
suicidal ideation or suicide attempt.
Family support for families facing stress and
difficulty—Young people with suicidal behaviour are frequently
characterised by social, educational, and economic disadvantage. Improvements in
family wellbeing and health care may contribute to suicide prevention by
reducing risks of childhood and adolescent adjustment disorders which are often
precursors of suicidal behaviour.
A range of family support or home visitation programmes have
been undertaken in several countries, including New Zealand, with the multiple
aims of improving home environments, encouraging family wellness, preventing
maternal depression and child behaviour problems, and, generally optimising
outcomes for children born into disadvantaged and dysfunctional family
environments.67 There is a need for more
research to establish programme efficacy, identify critical components, and
assess impacts on a wide range of psychosocial outcomes including the
development of psychosocial and psychiatric problems with which suicidal
behaviour is associated.
Initiatives for which evidence of harmful effects existSeveral approaches directed at suicide prevention have been
found to be harmful or potentially harmful. These approaches include:
School-based programmes that focus on raising
awareness about suicide—There is little evidence that didactic
school based suicide prevention programmes which focus on raising awareness
about suicide in school students, and which may or may not include youth peer
support for suicidal young people, are effective is reducing suicidal behaviour
and there are concerns that such programmes may not be
safe.68,69
There have been suggestions that young people exposed to
such programmes either show no benefits or a decrease in desirable attitudes and
are less likely to recommend a friend with suicidal ideation seek mental health
care, that young males show increased hopelessness and maladaptive behaviour,
and there have been concerns that the format and content might inadvertently
normalise suicidal behaviour or promote
imitation.70,71 Until there is clear evidence
that such programmes are both beneficial and without risk, their use cannot be
recommended.
Public health messages about suicide and media
coverage of suicide issues—It is intuitively appealing to many
that media coverage of suicide issues and the media dissemination of information
about suicide could make a useful contribution to suicide prevention. However,
there is no evidence that public health messages about suicide are beneficial,
and there are concerns that such messages might risk normalising suicide rather
than preventing it.72
Until there is clear evidence that public health messages
about suicide prevent, and do not normalise, suicide, and have no deleterious
effects, the most prudent approach to this issue is not to include public health
messages as part of a suicide prevention strategy.
No-harm and no-suicide contracts—The
use of no-suicide or no-harm contracts in mental health settings to elicit
patient guarantees of safety is widespread, despite no evidence that their use
reduces suicide attempts and many cautions about their
use.59,73,74 There are concerns that the use of
such contracts may induce a sense of false security in the therapist and anger
or inhibit patients.
Recovered or repressed memory
therapies—General concerns have been expressed about recovered
memory therapies 75, and there is evidence from
one, albeit methodologically flawed, study with patients with histories of
deliberate self harm treated with such therapy that suggested increased rates of
suicide attempt.76
ConclusionWhile many national policies for suicide prevention are
undertaken as public health campaigns with an explicit focus on universal,
population-wide interventions, our current knowledge about suicide causation and
prevention suggests that perhaps the most effective approach to reducing suicide
may be highly targeted interventions that focus on those who have made suicide
attempts who have a long term elevated risk of further suicidal behaviour, and a
range of poor psychosocial and mental health outcomes which are likely to
precipitate further suicide attempts.
Educating medical practitioners to offer optimal long term
care and support for these patients, developing networks of integrated hospital
and community care for them, and improving combinations of pharmacotherapy,
psychotherapy and psychosocial support may more effectively reduce suicide rates
than more generic, broadly based interventions. Exceptions are the population
based interventions involving means restriction and careful media coverage and
presentation of suicide issues.
In summary, the available evidence thus far suggests that
the most promising interventions likely to be effective in reducing suicidal
behaviours are medical practitioner and gatekeeper education, and restriction of
access to lethal means of suicide. This evidence also suggests a clear agenda
for research, which includes evaluating interventions and prevention programmes,
developing model and demonstration projects, identifying meaningful outcome
measures, and refining and identifying the critical elements of effective
programmes.
Competing interests: None.
Author information: Annette Beautrais,
Research Associate Professor1;
David Fergusson, Professor1; Carolyn
Coggan, Director2;
Catherine D Collings, Senior Lecturer3;
Carolyn Doughty, Research Fellow, NZHTA1; Pete
M Ellis, Professor3; Simon Hatcher, Senior
Lecturer4; L John Horwood, Senior Research
Fellow1; Sally N Merry, Senior
Lecturer4; Roger Mulder,
Professor1; Richie Poulton,
Professor5; Lois Surgenor, Senior
Lecturer1
Correspondence:
Annette L Beautrais, Canterbury Suicide Project, Christchurch School of Medicine
and Health Sciences, P O Box 4345, Christchurch.
Fax: (03) 372 0407; email: suicide@chmeds.ac.nz References:
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