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maltreatment & adversity outcomes
The operative claimChildhood maltreatment (abuse and neglect) is associated with substantially elevated lifelong risk of depression, anxiety, PTSD, substance use, and suicidality; quasi-experimental and genetically-informed designs indicate part of this association is causal, though smaller than raw associations because shared genetic and environmental factors also contribute.
Established that childhood maltreatment is associated with, and partly causes, elevated lifelong psychopathology risk; the agreed nuance is that confounding accounts for a meaningful share.
Drawn from very large observational meta-analyses (Norman 2012, 124 studies; Li 2015, prospective) alongside a quasi-experimental meta-analysis (Baldwin 2023: d falls from 0.56 to 0.31 after adjustment) and twin/Mendelian-randomization designs. The causal contribution is small-to-moderate and consistent across disorders; familial confounding accounts for a meaningful share of the risk.
Baldwin, J. R., Wang, B., Karwatowska, L., Schoeler, T., Tsaligopoulou, A., Munafò, M. R., & Pingault, J.-B (2023). Childhood maltreatment and mental health problems: A systematic review and meta-analysis of quasi-experimental studies. The American Journal of Psychiatry.
Systematic review
Before adjustment, maltreatment was moderately associated with mental-health problems (d=0.56); after quasi-experimental adjustment a small association remained (d=0.31), consistent with a small causal contribution plus familial confounding.
doi.org/10.1176/appi.ajp.20220174Norman, R. E., Byambaa, M., De, R., Butchart, A., Scott, J., & Vos, T (2012). The long-term health consequences of child physical abuse, emotional abuse, and neglect: A systematic review and meta-analysis. PLoS Medicine.
Meta-analysis
Physical abuse, emotional abuse, and neglect were each significantly associated with depression, drug use, suicide attempts, and risky sexual behavior; Bradford Hill assessment supported a causal relationship.
doi.org/10.1371/journal.pmed.1001349Li, M., D'Arcy, C., & Meng, X (2015). Maltreatment in childhood substantially increases the risk of adult depression and anxiety in prospective cohort studies. Psychological Medicine.
Meta-analysis
Any childhood maltreatment was associated with adult depression (OR 2.03) and anxiety (OR 2.70); over half of depression/anxiety cases were potentially attributable to maltreatment.
doi.org/10.1017/s0033291715002743Daníelsdóttir, H. B., Aspelund, T., Shen, Q., Halldorsdottir, T., et al (2024). Adverse childhood experiences and adult mental health outcomes. JAMA Psychiatry.
Observational
Associations between adverse childhood experiences and clinically confirmed adult psychiatric disorders persisted within discordant twin pairs, though attenuated, after controlling for shared genetic and environmental confounding.
doi.org/10.1001/jamapsychiatry.2024.0039Counter-authority (1). Studies an adversary may cite — surfaced deliberately so the grade is honest about its limits.
Dinkler, L., Lundström, S., Gajwani, R., Lichtenstein, P., Gillberg, C., & Minnis, H (2017). Maltreatment-associated neurodevelopmental disorders: A co-twin control analysis. Journal of Child Psychology and Psychiatry.
Observational
Maltreated children had more neurodevelopmental disorders, but CM-discordant monozygotic twins did not differ in NDD load — most covariance was explained by shared genetic effects, not a causal effect of maltreatment.
doi.org/10.1111/jcpp.126824 supporting · 1 counter verified sources
Quasi-experimental adjustment roughly halves the effect, signaling substantial familial confounding; effects are broadband rather than specific to one disorder; these are population-level risks that do not establish causation in an individual; and maltreatment is neither necessary nor sufficient for poor outcomes.