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Predicting suicide following self-harm: systematic review of risk factors and risk scales

Published online by Cambridge University Press:  02 January 2018

Melissa K. Y. Chan*
Affiliation:
Centre for Suicide Research and Prevention, University of Hong Kong, Pok Fu Lam, Hong Kong
Henna Bhatti
Affiliation:
Centre for Addiction and Mental Health, Toronto, Ontario, Canada
Nick Meader
Affiliation:
Centre for Reviews and Dissemination, The University of York, York, UK
Sarah Stockton
Affiliation:
National Collaborating Centre for Mental Health, Royal College of Psychiatrists' Research and Training Unit, London, UK
Jonathan Evans
Affiliation:
Centre for Academic Mental Health, School of Social & Community Medicine, University of Bristol, Bristol, UK
Rory C. O'Connor
Affiliation:
Institute of Health and Wellbeing, University of Glasgow, Glasgow, UK
Nav Kapur
Affiliation:
Centre for Suicide Prevention, Centre for Mental Health and Safety, University of Manchester, and Manchester Mental Health and Social Care Trust, Manchester, UK
Tim Kendall
Affiliation:
National Collaborating Centre for Mental Health, Royal College of Psychiatrists' Research and Training Unit, London, UK
*
Melissa K. Y. Chan, University of Hong Kong, Centre for Suicide Research and Prevention, 5 Sassoon Road, Pok Fu Lam, Hong Kong. Email: ckymelissa@gmail.com
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Abstract

Background

People with a history of self-harm are at a far greater risk of suicide than the general population. However, the relationship between self-harm and suicide is complex.

Aims

To undertake the first systematic review and meta-analysis of prospective studies of risk factors and risk assessment scales to predict suicide following self-harm.

Method

We conducted a search for prospective cohort studies of populations who had self-harmed. For the review of risk scales we also included studies examining the risk of suicide in people under specialist mental healthcare, in order to broaden the scope of the review and increase the number of studies considered. Differences in predictive accuracy between populations were examined where applicable.

Results

Twelve studies on risk factors and 7 studies on risk scales were included. Four risk factors emerged from the metaanalysis, with robust effect sizes that showed little change when adjusted for important potential confounders. These included: previous episodes of self-harm (hazard ratio (HR) = 1.68, 95% CI 1.38–2.05, K = 4), suicidal intent (HR = 2.7, 95% CI 1.91–3.81, K = 3), physical health problems (HR = 1.99, 95% CI 1.16–3.43, K = 3) and male gender (HR = 2.05, 95% CI 1.70–2.46, K = 5). The included studies evaluated only three risk scales (Beck Hopelessness Scale (BHS), Suicide Intent Scale (SIS) and Scale for Suicide Ideation). Where meta-analyses were possible (BHS, SIS), the analysis was based on sparse data and a high heterogeneity was observed. The positive predictive values ranged from 1.3 to 16.7%.

Conclusions

The four risk factors that emerged, although of interest, are unlikely to be of much practical use because they are comparatively common in clinical populations. No scales have sufficient evidence to support their use. The use of these scales, or an over-reliance on the identification of risk factors in clinical practice, may provide false reassurance and is, therefore, potentially dangerous. Comprehensive psychosocial assessments of the risks and needs that are specific to the individual should be central to the management of people who have self-harmed.

Information

Type
Review Articles
Copyright
Copyright © Royal College of Psychiatrists, 2016 
Figure 0

Table 1 Summary of risk factors for adults following an episode of self-harm

Figure 1

Table 2 Results for predictive validity of scales

Figure 2

Fig. 1 Hierarchical summary receiver operating characteristic (HSROC) plot for (a) Beck Hopelessness Scale and (b) Suicide Intent Scale for predicting suicide.

Figure 3

Fig. 2 Forest plots for (a) Beck Hopelessness Scale and (b) Suicide Intent Scale for predicting suicide.TP, true positive; FP, false positive; FN, false negative; TN, true negative.

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