School- and class-level variation in self-harm, suicide ideation and suicide attempts in Danish high schools

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

AIM: Strong associations have been found between being exposed to self-harm in family and friends and own self-harm in adolescence. Therefore, self-harm and suicide behaviour might tend to cluster within school and school classes. The aim of this study was to describe the prevalence, frequency and type of self-harm, suicide ideation and suicide attempts within Danish high schools and to test whether self-harm and suicide behaviour cluster in schools and school classes.

METHODS: Data came from the Danish National Youth Study 2014, a national survey. The respective study included 66,284 high-school students nested in 117 schools and 3146 school classes. The prevalence and clustering of self-harm behaviour, ever and within the last year, type of self-harm (e.g. cutting, burning, scratching and hitting) and suicide ideation and suicide attempts were investigated. Multi-level logistic regression was applied to quantify clustering among participants within the same class and school.

RESULTS: In total, 12,960 (20%) reported self-harm ever and 5706 (8.6%) within the last year. Prevalence was higher among girls than boys. Among girls, cutting (15%) and scratching (13%) was the most common type of self-harm, whereas among boys, hitting (6.7%) was most prevalent. The degree of clustering of self-harm and suicide behaviour was low, with school-level intra-class correlation coefficients (ICC) ranging from 0.8-1.8% and school class level ICC's from 4.3-6.8%.

CONCLUSIONS: This study shows that self-harm was common, especially in girls. The degree of clustering of self-harm and suicide behaviour in school and school classes was low.

Original languageEnglish
Book seriesScandinavian Journal of Public Health
Volume47
Issue number2
Pages (from-to)146-156
ISSN1403-4956
DOIs
Publication statusPublished - 1 Mar 2019

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Cluster Analysis
Logistic Models

Keywords

  • Clustering
  • school-level variation
  • self-harm
  • suicide attempt
  • suicide ideation
  • youth
  • Prevalence
  • Humans
  • Risk Factors
  • Male
  • Self-Injurious Behavior/epidemiology
  • Suicidal Ideation
  • Educational Status
  • Suicide, Attempted/statistics & numerical data
  • Schools/statistics & numerical data
  • Denmark/epidemiology
  • Adolescent
  • Female
  • Students/psychology
  • Surveys and Questionnaires

Cite this

@article{f5747f4ff3be4d2f8420c9fb8035ab65,
title = "School- and class-level variation in self-harm, suicide ideation and suicide attempts in Danish high schools",
abstract = "AIM: Strong associations have been found between being exposed to self-harm in family and friends and own self-harm in adolescence. Therefore, self-harm and suicide behaviour might tend to cluster within school and school classes. The aim of this study was to describe the prevalence, frequency and type of self-harm, suicide ideation and suicide attempts within Danish high schools and to test whether self-harm and suicide behaviour cluster in schools and school classes.METHODS: Data came from the Danish National Youth Study 2014, a national survey. The respective study included 66,284 high-school students nested in 117 schools and 3146 school classes. The prevalence and clustering of self-harm behaviour, ever and within the last year, type of self-harm (e.g. cutting, burning, scratching and hitting) and suicide ideation and suicide attempts were investigated. Multi-level logistic regression was applied to quantify clustering among participants within the same class and school.RESULTS: In total, 12,960 (20{\%}) reported self-harm ever and 5706 (8.6{\%}) within the last year. Prevalence was higher among girls than boys. Among girls, cutting (15{\%}) and scratching (13{\%}) was the most common type of self-harm, whereas among boys, hitting (6.7{\%}) was most prevalent. The degree of clustering of self-harm and suicide behaviour was low, with school-level intra-class correlation coefficients (ICC) ranging from 0.8-1.8{\%} and school class level ICC's from 4.3-6.8{\%}.CONCLUSIONS: This study shows that self-harm was common, especially in girls. The degree of clustering of self-harm and suicide behaviour in school and school classes was low.",
keywords = "Clustering, school-level variation, self-harm, suicide attempt, suicide ideation, youth, Prevalence, Humans, Risk Factors, Male, Self-Injurious Behavior/epidemiology, Suicidal Ideation, Educational Status, Suicide, Attempted/statistics & numerical data, Schools/statistics & numerical data, Denmark/epidemiology, Adolescent, Female, Students/psychology, Surveys and Questionnaires",
author = "Pisinger, {Veronica S C} and Keith Hawton and Tolstrup, {Janne S}",
year = "2019",
month = "3",
day = "1",
doi = "10.1177/1403494818799873",
language = "English",
volume = "47",
pages = "146--156",
journal = "Scandinavian Journal of Public Health. Supplement",
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School- and class-level variation in self-harm, suicide ideation and suicide attempts in Danish high schools. / Pisinger, Veronica S C; Hawton, Keith; Tolstrup, Janne S.

In: Scandinavian Journal of Public Health, Vol. 47, No. 2, 01.03.2019, p. 146-156.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - School- and class-level variation in self-harm, suicide ideation and suicide attempts in Danish high schools

AU - Pisinger, Veronica S C

AU - Hawton, Keith

AU - Tolstrup, Janne S

PY - 2019/3/1

Y1 - 2019/3/1

N2 - AIM: Strong associations have been found between being exposed to self-harm in family and friends and own self-harm in adolescence. Therefore, self-harm and suicide behaviour might tend to cluster within school and school classes. The aim of this study was to describe the prevalence, frequency and type of self-harm, suicide ideation and suicide attempts within Danish high schools and to test whether self-harm and suicide behaviour cluster in schools and school classes.METHODS: Data came from the Danish National Youth Study 2014, a national survey. The respective study included 66,284 high-school students nested in 117 schools and 3146 school classes. The prevalence and clustering of self-harm behaviour, ever and within the last year, type of self-harm (e.g. cutting, burning, scratching and hitting) and suicide ideation and suicide attempts were investigated. Multi-level logistic regression was applied to quantify clustering among participants within the same class and school.RESULTS: In total, 12,960 (20%) reported self-harm ever and 5706 (8.6%) within the last year. Prevalence was higher among girls than boys. Among girls, cutting (15%) and scratching (13%) was the most common type of self-harm, whereas among boys, hitting (6.7%) was most prevalent. The degree of clustering of self-harm and suicide behaviour was low, with school-level intra-class correlation coefficients (ICC) ranging from 0.8-1.8% and school class level ICC's from 4.3-6.8%.CONCLUSIONS: This study shows that self-harm was common, especially in girls. The degree of clustering of self-harm and suicide behaviour in school and school classes was low.

AB - AIM: Strong associations have been found between being exposed to self-harm in family and friends and own self-harm in adolescence. Therefore, self-harm and suicide behaviour might tend to cluster within school and school classes. The aim of this study was to describe the prevalence, frequency and type of self-harm, suicide ideation and suicide attempts within Danish high schools and to test whether self-harm and suicide behaviour cluster in schools and school classes.METHODS: Data came from the Danish National Youth Study 2014, a national survey. The respective study included 66,284 high-school students nested in 117 schools and 3146 school classes. The prevalence and clustering of self-harm behaviour, ever and within the last year, type of self-harm (e.g. cutting, burning, scratching and hitting) and suicide ideation and suicide attempts were investigated. Multi-level logistic regression was applied to quantify clustering among participants within the same class and school.RESULTS: In total, 12,960 (20%) reported self-harm ever and 5706 (8.6%) within the last year. Prevalence was higher among girls than boys. Among girls, cutting (15%) and scratching (13%) was the most common type of self-harm, whereas among boys, hitting (6.7%) was most prevalent. The degree of clustering of self-harm and suicide behaviour was low, with school-level intra-class correlation coefficients (ICC) ranging from 0.8-1.8% and school class level ICC's from 4.3-6.8%.CONCLUSIONS: This study shows that self-harm was common, especially in girls. The degree of clustering of self-harm and suicide behaviour in school and school classes was low.

KW - Clustering

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KW - suicide attempt

KW - suicide ideation

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KW - Prevalence

KW - Humans

KW - Risk Factors

KW - Male

KW - Self-Injurious Behavior/epidemiology

KW - Suicidal Ideation

KW - Educational Status

KW - Suicide, Attempted/statistics & numerical data

KW - Schools/statistics & numerical data

KW - Denmark/epidemiology

KW - Adolescent

KW - Female

KW - Students/psychology

KW - Surveys and Questionnaires

U2 - 10.1177/1403494818799873

DO - 10.1177/1403494818799873

M3 - Journal article

VL - 47

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EP - 156

JO - Scandinavian Journal of Public Health. Supplement

JF - Scandinavian Journal of Public Health. Supplement

SN - 1403-4956

IS - 2

ER -