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Experiencing abuse or neglect as a child can cause multiple mental health problems, finds a new study led by University College London (UCL) researchers.
The research, published in the American Journal of Psychiatry, sought to examine the causal effects of childhood maltreatment on mental health by accounting for other genetic and environmental risk factors, such as a family history of mental illness and socioeconomic disadvantage.
The first-of-its-kind research analyzed 34 quasi-experimental studies, involving over 54,000 people.
Quasi-experimental studies can better establish cause and effect in observational data, by using specialized samples (e.g., identical twins) or innovative statistical techniques to rule out other risk factors. For example, in samples of identical twins, vytorin 3733 if a maltreated twin has mental health problems but their non-maltreated twin does not, the association cannot be due to genetics or the family environment shared between twins.
Across the 34 studies, researchers found small effects of child maltreatment on a range of mental health problems, including internalizing disorders (e.g., depression, anxiety, self-harm, and suicide attempts), externalizing disorders (e.g., alcohol and drug abuse, ADHD, and conduct problems), and psychosis. These effects were consistent regardless of the method used or way in which maltreatment and mental health were measured.
The findings suggest that preventing eight cases of child maltreatment would prevent one person from developing mental health problems.
Corresponding author Dr. Jessie Baldwin (UCL Psychology & Language Sciences) said, “It is well known that child maltreatment is associated with mental health problems, but it was unclear whether this relationship is causal, or is better explained by other risk factors. This study provides rigorous evidence to suggest that childhood maltreatment has small causal effects on mental health problems. Although small, these effects of maltreatment could have far-reaching consequences, given that mental health problems predict a range of poor outcomes, such as unemployment, physical health problems and early mortality. Interventions that prevent maltreatment are therefore not only essential for child welfare, but could also prevent long-term suffering and financial costs due to mental illness.”
Nevertheless, the researchers also found that part of the overall risk of mental health problems in individuals exposed to maltreatment was due to pre-existing vulnerabilities—which might include other adverse environments (e.g., socioeconomic disadvantage) and genetic liability.
Dr. Baldwin said, “Our findings also suggest that to minimize risk of mental health problems in individuals exposed to maltreatment, clinicians should address not only the maltreatment experience, but also pre-existing psychiatric risk factors.”
Researchers defined childhood maltreatment as any physical, sexual or emotional abuse or neglect before the age of 18.
Each of the quasi-experimental studies analyzed may have been subject to potential biases. However, the findings were consistent across studies using different quasi-experimental methods, suggesting that the results are robust.
Additionally, it was not possible to draw firm conclusions about the specific effects of different types of maltreatment, as it is common for different types of abuse/neglect to happen at the same time, and studies rarely account for this.
The lack of available data mean that it was not possible to examine the effects of the timing of maltreatment, the interval between maltreatment and mental health issues, or differences between racial or ethnic groups. Future quasi-experimental research is needed to address these questions.
Childhood maltreatment and mental health problems: A systematic review and meta-analysis of quasi-experimental studies, American Journal of Psychiatry (2023). DOI: 10.1176/appi.ajp.20220174
American Journal of Psychiatry
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