The epidemiology and prevention of suicide by hanging: a systematic review

BACKGROUND: Hanging is one of the most commonly used methods for suicide worldwide. In England and a number of other countries, its incidence has increased over the last 30 years. This review summarizes the published literature on suicide by hanging. The focus is on its epidemiology in England and on identifying potential means of prevention. METHODS: We searched Medline (1966-2003), Embase (1980-2003), CINAHL (1982-2003) and PsycINFO (1967-2003). As considerable research on suicides occurring in prisons and psychiatric hospitals in England and Wales has been carried out by the National Confidential Inquiry into Suicide and Homicide (Manchester) and the Prison Service's Safer Custody Group, we obtained additional information from these sources. RESULTS: Only a small proportion (around 10%) of hanging suicides occur in the controlled environments of hospitals, prisons, and police custody; the remainder occur in the community. The most commonly used ligatures (rope, belts, flex) and ligature points (beams, banisters, hooks, door knobs, and trees) are widely available; thus prevention strategies focused around restriction of access to means of hanging are of limited value. Around 50% of hanging suicides are not fully suspended--ligature points below head level are commonly used. Case fatality following attempted suicide by hanging is around 70%; the majority (80-90%) of those who reach hospital alive survive. CONCLUSION: Strategies to reduce suicide by hanging should focus on the prevention of suicide in controlled environments, the emergency management of 'near-hanging' and on the primary prevention of suicide in general. More research is required to better understand the recent rise in popularity of this method.     

HIV prevention cost-effectiveness: a systematic review

Background

After more than 25 years, public health programs have not been able to sufficiently reduce the number of new HIV infections. Over 7,000 people become infected with HIV every day. Lack of convincing evidence of cost-effectiveness (CE) may be one of the reasons why implementation of effective programs is not occurring at sufficient scale. This paper identifies, summarizes and critiques the CE literature related to HIV-prevention interventions in low- and middle-income countries during 2005-2008.

Methods

Systematic identification of publications was conducted through several methods: electronic databases, internet search of international organizations and major funding/implementing agencies, and journal browsing. Inclusion criteria included: HIV prevention intervention, year for publication (2005-2008), setting (low- and middle-income countries), and CE estimation (empirical or modeling) using outcomes in terms of cost per HIV infection averted and/or cost per disability-adjusted life year (DALY) or quality-adjusted life year (QALY).

Results

We found 21 distinct studies analyzing the CE of HIV-prevention interventions published in the past four years (2005-2008). Seventeen CE studies analyzed biomedical interventions; only a few dealt with behavioral and environmental/structural interventions. Sixteen studies focused on sub-Saharan Africa, and only a handful on Asia, Latin America and Eastern Europe. Many HIV-prevention interventions are very cost effective in absolute terms (using costs per DALY averted), and also in country-specific relative terms (in cost per DALY measured as percentage of GDP per capita).

Conclusion

There are several types of interventions for which CE studies are still not available or insufficient, including surveillance, abstinence, school-based education, universal precautions, prevention for positives and most structural interventions. The sparse CE evidence available is not easily comparable; thus, not very useful for decision making. More than 25 years into the AIDS epidemic and billions of dollars of spending later, there is still much work to be done both on costs and effectiveness to adequately inform HIV prevention planning.

     

Temperature-associated suicide mortality: contrasting roles of climatic warming and the suicide prevention program in Finland

Objectives

Suicide is a notable cause of death worldwide, and while suicidal behavior appears to be associated with variations in temperature, no estimations are available of climate change impacts on suicide rates. The study aims to evaluate the influence of temperature on suicide mortality, especially on multi-decadal and longer time scales, that is, at scales on which the ongoing warming distinctly operates and is correspondingly appropriate for the current policy responses to warming climate.

Methods

Our results are based on an extraordinarily long record of deaths from suicide in Finland from 1751 to 2008, and a similarly long climatic record of ambient temperatures correlative of environmental change in the study region.

Results

We show that temperature variability explains more than 60 % of the total suicide variance up until the initiation of a national suicide prevention program. Despite ongoing warming, suicide rates have declined since the initiation of the program.

Conclusion

By understanding the complexity of suicidal behavior as a response to ambient warming and the observed effects of interventions, our results underline the pressing need for a network of prevention programs to battle against temperature-mediated health hazards.     

Child maltreatment prevention: a systematic review of reviews

Objective

To synthesize recent evidence from systematic and comprehensive reviews on the effectiveness of universal and selective child maltreatment prevention interventions, evaluate the methodological quality of the reviews and outcome evaluation studies they are based on, and map the geographical distribution of the evidence.

Methods

A systematic review of reviews was conducted. The quality of the systematic reviews was evaluated with a tool for the assessment of multiple systematic reviews (AMSTAR), and the quality of the outcome evaluations was assessed using indicators of internal validity and of the construct validity of outcome measures.

Findings

The review focused on seven main types of interventions: home visiting, parent education, child sex abuse prevention, abusive head trauma prevention, multi-component interventions, media-based interventions, and support and mutual aid groups. Four of the seven – home-visiting, parent education, abusive head trauma prevention and multi-component interventions – show promise in preventing actual child maltreatment. Three of them – home visiting, parent education and child sexual abuse prevention – appear effective in reducing risk factors for child maltreatment, although these conclusions are tentative due to the methodological shortcomings of the reviews and outcome evaluation studies they draw on. An analysis of the geographical distribution of the evidence shows that outcome evaluations of child maltreatment prevention interventions are exceedingly rare in low- and middle-income countries and make up only 0.6% of the total evidence base.

Conclusion

Evidence for the effectiveness of four of the seven main types of interventions for preventing child maltreatment is promising, although it is weakened by methodological problems and paucity of outcome evaluations from low- and middle-income countries.     

Efficient interventions on suicide prevention: A literature review

AimThis review focuses on interventions to prevent suicide. It excludes psychotherapy evaluations and pharmaceutical clinical trials. The aim of this article is to provide useful input to the reflection on and the development of actions for professionals who may be concerned by suicide prevention.MethodThis research is based on 41 published evaluation studies presenting results on at least one of the three following outcomes: completed suicides, suicide attempts, and suicidal ideations. These studies have been classified into seven categories of preventive action.ResultsAccording to data from the literature selected for our analysis, the three most efficient categories of intervention seem to be the limitation of access to lethal means, the preservation of contact with the patients hospitalized for a suicide attempt after hospitalization, and the implementation of emergency call centers. The four other categories of intervention examined in this study — the training of general practitioners, the reorganization of care, programs in schools, and information campaigns — have not yet shown sufficient proof of their efficacy. Nevertheless, these interventions, under certain conditions, can also contribute significantly to the prevention of suicide.ConclusionThe majority of effective interventions minister to people already suffering from psychological disorders, but health promotion initiatives prior to situations of psychological disorders also deserve to be considered, in particular the implementation of services for the isolated elderly.     

School-based prevention for illicit drugs use: a systematic review

OBJECTIVE: To evaluate the effectiveness of school-based interventions in preventing or reducing drug use. METHODS: The search strategy was conducted according to the Cochrane Collaboration method, and applied to MEDLINE, EMBASE, ERIC, PSYCHINFO, Cochrane Library, ACP Journal Club, Cochrane Drugs and Alcohol Group Register. RCTs and CCTs evaluating school-based interventions designed to prevent substance use were reviewed. Data were extracted independently by two reviewers. Quality was assessed. Interventions were classified as skills, affective, and knowledge focused. RESULTS: 29 RCTs were included; 28 were conducted in the USA; most were focused on 6th-7th grade students. Compared with usual curricula, skills-based interventions significantly reduce marijuana use (RR=0.82; 95% CI: 0.73, 0.92) and hard drug use (RR=0.45; 95% CI: 0.24, 0.85), and improve decision-making skills, self-esteem, peer pressure resistance (RR=2.05; 95% CI: 1.24, 3.42) and drug knowledge. Compared with usual curricula, affective interventions improve decision-making skills and drug knowledge, and knowledge-focused programs improve drug knowledge. Skills-based interventions are better than affective ones in improved self-efficacy. No differences are evident for skills vs. knowledge-focused programs on drug knowledge. Affective interventions improve decision-making skills and drug knowledge to a higher degree than knowledge-focused programs. CONCLUSION: Skills-based programs help to deter drug use. Well designed, long-term randomised trials, and evaluation of intervention components are required.     

Native American childhood obesity prevention interventions: a systematic review

Native American populations are at higher risk for becoming obese and suffering from obesity-related illness compared with other populations. Concurrently, prevention methods have not been successful with this group, especially intervention attempts aimed at children, which have been few and ineffective. The purpose of this systematic review was to evaluate the effectiveness and methodologies of childhood obesity prevention interventions targeting Native American youth, and to make recommendations to future researchers and practitioners. Seven databases (Medline, Academic Search Premier, CINAHL, ERIC, Health Source Nursing, PsychINFO, and Sport Discus) were utilized to retrieve articles, using four sets of keywords; 1. Children AND Obesity AND Native American AND Program; 2. Children AND Obesity AND Native American AND Intervention; 3. Children AND Obesity AND Indian AND Program; and 4. Children AND Obesity AND Indian AND Intervention. Overall, six articles were found and evaluated for salient findings and key methodological issues such as use of theory, intervention duration, research design, outcome measures, process evaluation, and validated measures. Results indicated that theory was seldom used in planning the interventions, process evaluations were used some of the time, and half of the interventions were smaller pilot studies. This review suggests that there have been few interventions targeting obesity prevention among Native American youth over the past decade. Recommendations for enhancing such programs are discussed.     

Depression in the workplace: a systematic review of evidence-based prevention strategies

Background  

Depression is one of the most common mental disorders, causing enormous personal and economic burden. In its early stages, however, it is the most manageable of mental disorders. The workplace, where a large proportion of the adult population can be reached, might be a good setting for prevention interventions that target depression directly.     

School-based smoking prevention programs for adolescents in South Korea: a systematic review

The number of research papers evaluating programs designed to prevent adolescent smoking have increased in the last 13 years in Korea. The purpose of this study was to evaluate these programs, to review the features of the studies and to systemically assess the results on the knowledge about, and attitude to, smoking and smoking behavior. Database searched were national digital library (NDL) and the Research Information Service System, which are major literature search systems for all academic fields in South Korea, and the Research Information Center for Health, which is a database for health field. A total of 11 papers were included. Program contents are described under five categories and the mode of delivery is described. Methodological features were investigated and effect of the size of the study on variables investigated was computed. Knowledge was the main content of the program in most of the studies. Most studies delivered classroom-based instructions that were mainly didactic presentations. School-based smoking programs have not influenced adolescent smoking behavior as much as anticipated. Methodological problems were discussed. Several recommendations are made to improve effectiveness of smoking prevention programs and reduce methodological flaws in future studies.     

Pediatric smoking prevention interventions delivered by care providers: a systematic review

OBJECTIVE: To conduct a systematic review of randomized controlled trials of smoking prevention interventions for youth delivered via medical or dental providers' offices. METHODS: Online bibliographic databases were searched as of July 2002, and reference lists from review articles and the selected articles were also reviewed for potential studies. The methodology and findings of all retrieved articles were critically evaluated. Data were extracted from each article regarding study methods, intervention studied, outcomes measured, and results. RESULTS: The literature search returned 81 abstracts from MEDLINE and 49 from Cochrane Clinical Trials Registry (CCTR); of these, four articles met the inclusion criteria. Included were two studies conducted in primary care, and one each in dental and orthodontic offices. Only one study demonstrated a significant effect on smoking initiation; in that study, 5.1% of the intervention group and 7.8% of the control group reported smoking at 12-month follow-up (odds ratio= 0.63; 95% confidence interval, 0.44-0.91). None of the studies had follow-up times greater than 3 years. CONCLUSIONS: There is very limited available evidence demonstrating efficacy of smoking prevention interventions in adolescents conducted in providers' offices and no evidence for long-term effectiveness of such interventions.     

Social deprivation and the prevention of unintentional injury in childhood: a systematic review

There is a known association between social deprivation and risk of death from unintentional injury in childhood. In the UK context, these inequalities do not appear to be decreasing. This paper reports on the findings of a systematic review of the world literature between 1975 and 2000 on the prevention of childhood injuries, with particular reference to social deprivation. Literature was identified via electronic databases, key journals and informants. All papers were read independently by at least two reviewers and information was extracted using a standardized form. Results indicate that of 155 studies identified in the systematic review, 32 addressed the issue of social deprivation. The way social deprivation was defined in different studies varied considerably. The literature was not evenly spread across different injury types and did not reflect the burden of injury. There is a paucity of evidence relating to the prevention of child pedestrian injury. Very few studies examined the impact of interventions in different social groups. Without such evidence, it remains difficult for those involved in health promotion to know how to design and target interventions to address inequalities in child injury rates.     

Primary prevention of latex related sensitisation and occupational asthma: a systematic review

Methods

Eight primary prevention intervention studies on natural rubber latex (NRL) published since 1990 were identified and reviewed. This is the largest evidence base of primary prevention studies for any occupational asthmagen.

Results

Review of this small and largely observational evidence base supports the following evidence statement: Substitution of powdered latex gloves with low protein powder‐free NRL gloves or latex‐free gloves greatly reduces NRL aeroallergens, NRL sensitisation, and NRL‐asthma in healthcare workers. Evidence in support of this statement is ranked SIGN level 2+, referring to well conducted case‐control or cohort studies with a low risk of confounding, bias, or chance and a moderate probability that the relationship is causal.

Conclusion

Substitution of powdered latex gloves with low protein powder‐free NRL gloves or latex‐free gloves promises benefits to both workers'' health and cost and human resource savings for employers. This message should be broadly disseminated beyond the hospital sector to include other healthcare settings (such as aged care facilities) as well as food service and other industries where latex gloves might be used.     

Media coverage as a risk factor in suicide

A total of 293 findings from 42 studies on the impact of publicized suicide stories in the media on the incidence of suicide in the real world were analyzed by logistic regression analysis. Studies measuring the effect of either an entertainment or political celebrity suicide story were 14.3 times more likely to find a copycat effect than studies that did not. Studies based on a real as opposed to fictional story were 4.03 times more likely to uncover a copycat effect. Research based on televised stories was 82% less likely to report a copycat effect than research based on newspapers. A review of recent events in Austria and Switzerland indicates that suicide prevention organizations can successfully convince the media to change the frequency and content of their suicide coverage in an effort to reduce copycat effects.     

Behavioural interventions for HIV positive prevention in developing countries: a systematic review and meta-analysis

Objective

To assess the evidence for a differential effect of positive prevention interventions among individuals infected and not infected with human immunodeficiency virus (HIV) in developing countries, and to assess the effectiveness of interventions targeted specifically at people living with HIV.

Methods

We conducted a systematic review and meta-analysis of papers on positive prevention behavioural interventions in developing countries published between January 1990 and December 2006. Standardized methods of searching and data abstraction were used. Pooled effect sizes were calculated using random effects models.

Findings

Nineteen studies met the inclusion criteria. In meta-analysis, behavioural interventions had a stronger impact on condom use among HIV-positive (HIV+) individuals (odds ratio, OR: 3.61; 95% confidence interval, CI: 2.61–4.99) than among HIV-negative individuals (OR: 1.32; 95% CI: 0.77–2.26). Interventions specifically targeting HIV+ individuals also showed a positive effect on condom use (OR: 7.84; 95% CI: 2.82–21.79), which was particularly strong among HIV-serodiscordant couples (OR: 67.38; 95% CI: 36.17–125.52). Interventions included in this review were limited both in scope (most were HIV counselling and testing interventions) and in target populations (most were conducted among heterosexual adults or HIV-serodiscordant couples).

Conclusion

Current evidence suggests that interventions targeting people living with HIV in developing countries increase condom use, especially among HIV-serodiscordant couples. Comprehensive positive prevention interventions targeting diverse populations and covering a range of intervention modalities are needed to keep HIV+ individuals physically and mentally healthy, prevent transmission of HIV infection and increase the agency and involvement of people living with HIV.     

Nutritional intervention and primary prevention of type 2 diabetes mellitus: a systematic review

Type 2 diabetes mellitus is one of the most important public health problems in the world. Its increasing prevalence in several countries and the difficult metabolic control of individuals with the disease justify studying strategies for primary prevention. Recent randomized clinical trials suggest that nutritional intervention may have an important impact on risk reduction for type 2 diabetes mellitus among individuals at high risk. The present systematic review describes the effect of lifestyle intervention trials on primary prevention of type 2 diabetes mellitus.