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The Cost of Violence

Violence against children (VAC) is a global challenge affecting up to 1.7 billion children every year (Hillis et al 2016). Early childhood is a critical period for all children – it has been conclusively recognised by research that this period is significant for young children’s rights in the here and now, for children’s future educational, economic and health outcomes, and ultimately societal flourishing. The aim of this workstream is to understand the concept of violence against children in the early years (i.e. 5 years and under) in order to contribute to the evidence base on how to create safe, inclusive learning environments. This systematic review will locate and synthesise research evidence on the prevalence of VAC in the early years. Details about the three key aspects of this work can be seen below.

Prevalence of violence

The systematic review will search for primary studies or systematic reviews published in peer-reviewed and non-peer-reviewed journal articles between January 1st 2000-December 31st 2021 in nine English-language databases, and the research team will search seven peer-reviewed journals.

For inclusion criteria, we will consider studies which include children aged 5 and below who are exposed to violence (e.g., child sexual abuse, child physical abuse, emotional abuse, community violence etc). The control group will be children aged 5 years and below who are not exposed to any form of violence. We will consider studies that report on the prevalence of any of the mentioned forms of violence perpetrated against children aged 5 and below, including but not limited to, child physical abuse, corporal punishment, intentional injury, child harm, bullying, gender-based violence, and child sexual abuse. The main outcome is the prevalence of violence against children aged 5 years and below. A flow chart of the review process will be included in the final report following PRISMA guidelines for reporting systematic reviews. We will use Hoy et al. (2012) checklist for assessing risk of bias in prevalence studies.

For each of the types of violence against children, a set of adjusted prevalence estimates will be combined using random-effects meta-analysis. Cochran’s Q tests will be conducted to assess the heterogeneity across studies.

Consequences of violence

This systematic review will locate and synthesise research evidence on the consequences of VAC in the early years. The systematic review will search for primary studies or systematic reviews published in peer-reviewed and non-peer-reviewed journal articles between January 1st 2000-December 31st 2021 in nine English-language databases and the research team will search seven peer-reviewed journals.

For inclusion criteria, we will consider studies which include children aged 5 and below who are exposed to violence (e.g., child sexual abuse, child physical abuse, emotional abuse, community violence etc). The control group will be children aged 5 years and below who are not exposed to any form of violence. The main outcomes of the systematic review are the consequences of violence against children aged 5 years and below. The outcomes were presented in four predominant types of consequences, namely physical health consequences, mental health consequences, sexual behavioural consequences, and other consequences. A flow chart of the review process will be included in the final report following PRISMA guidelines for reporting systematic reviews. Data will be extracted for consequences and recorded in an Excel file by type of maltreatment. We will use the Newcastle-Ottawa Scale for Non-Randomised Case-Control and Cohort Studies (Deeks et al., 2003) to assess the quality of the included studies.

A narrative synthesis of the consequences of violence against children in the early years from the included studies will be presented. A meta-analysis will be conducted if there are sufficient numbers of studies.

Burden analysis

Building on the systematic reviews reporting on the prevalence and consequences of violence against children in the early years, four steps will be taken to estimate the economic burden of violence against children in the early years:

  1. A meta-analysis to estimate prevalence by type of violence;
  2. Estimating the relative risks of health outcomes associated with violence against children;
  3. Calculation of population attributable fractions for specific outcomes and effects that are linked to violence against children;
  4. Estimating the economic value of DALYs (disability-adjusted life years) lost due to early childhood sexual violence.