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J R Soc Med. 2014 Feb 13;107(5):194-204. [Epub ahead of print]

Risk of self-harm and suicide in people with specific psychiatric and physical disorders: comparisons between disorders using English national record linkage.

Author information

  • 1University of Oxford Medical School, Medical Sciences Division, University of Oxford, Oxford OX3 9DU, UK.
  • 2Unit of Health-Care Epidemiology, Nuffield Department of Population Health, University of Oxford, Oxford OX3 7LF, UK.
  • 3Centre for Suicide Research, Department of Psychiatry, University of Oxford, Warneford Hospital, Oxford OX3 7JX, UK.
  • 4Unit of Health-Care Epidemiology, Nuffield Department of Population Health, University of Oxford, Oxford OX3 7LF, UK michael.goldacre@dph.ox.ac.uk.

Abstract

BACKGROUND:

Psychiatric illnesses are known risk factors for self-harm but associations between self-harm and physical illnesses are less well established. We aimed to stratify selected chronic physical and psychiatric illnesses according to their relative risk of self-harm.

DESIGN:

Retrospective cohort studies using a linked dataset of Hospital Episode Statistics (HES) for 1999-2011.

PARTICIPANTS:

Individuals with selected psychiatric or physical conditions were compared with a reference cohort constructed from patients admitted for a variety of other conditions and procedures.

SETTING:

All admissions and day cases in National Health Service (NHS) hospitals in England.

MAIN OUTCOME MEASURES:

Hospital episodes of self-harm. Rate ratios (RRs) were derived by comparing admission for self-harm between cohorts.

RESULTS:

The psychiatric illnesses studied (depression, bipolar disorder, alcohol abuse, anxiety disorders, eating disorders, schizophrenia and substance abuse) all had very high RRs (> 5) for self-harm. Of the physical illnesses studied, an increased risk of self-harm was associated with epilepsy (RR = 2.9, 95% confidence interval [CI] 2.8-2.9), asthma (1.8, 1.8-1.9), migraine (1.8, 1.7-1.8), psoriasis (1.6, 1.5-1.7), diabetes mellitus (1.6, 1.5-1.6), eczema (1.4, 1.3-1.5) and inflammatory polyarthropathies (1.4, 1.3-1.4). RRs were significantly low for cancers (0.95, 0.93-0.97), congenital heart disease (0.9, 0.8-0.9), ulcerative colitis (0.8, 0.7-0.8), sickle cell anaemia (0.7, 0.6-0.8) and Down's syndrome (0.1, 0.1-0.2).

CONCLUSIONS:

Psychiatric illnesses carry a greatly increased risk of self-harm as well as of suicide. Many chronic physical illnesses are also associated with an increased risk of both self-harm and suicide. Identifying those at risk will allow provision of appropriate monitoring and support.

© The Royal Society of Medicine.

KEYWORDS:

chronic illness; cohort study; physical illness; psychiatric illness; risk; self-harm; suicidality; suicide

PMID:
24526464
[PubMed - as supplied by publisher]
PMCID:
PMC4023515
Free PMC Article

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