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Childhood 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.
Childhood sexual abuse is associated with a broad, dose-responsive elevation in long-term psychiatric and physical-health risk — depression, anxiety, PTSD, suicidality, and substance dependence among them — and the strongest designs (umbrella reviews, longitudinal cohorts, discordant-twin studies) indicate the association is at least partly causal and not merely a product of shared family confounding; nonetheless many survivors show resilience and no measurable lasting impairment.
Children in foster care are prescribed psychotropic medications — antipsychotics and multi-drug regimens in particular — at rates several times those of otherwise-comparable Medicaid-enrolled children, including the high-risk practices (concomitant antipsychotics, four-plus-drug polypharmacy) with the least pediatric evidence; state oversight programs measurably reduce this prescribing, which is why federal law requires psychotropic monitoring protocols for children in care.
For young children deprived of parental care, placement into stable, high-quality family (foster) care rather than institutional care produces lasting gains in cognitive ability, attachment security, and mental health; benefits are larger with earlier placement and greater placement stability, although some deficits persist.
Among children in out-of-home care, placement instability (frequent placement changes) is associated with worse behavioral and mental-health outcomes — especially externalizing problems and PTSD symptoms — and propensity-adjusted work indicates an effect of instability beyond children's baseline problems; the relationship is partly bidirectional, since behavioral difficulties also drive disruptions.
Children placed with kin (relatives) in foster care generally show greater placement stability and fewer behavioral and mental-health problems than children in non-relative foster care; but much of the behavioral advantage reflects selection, and rigorous designs that adjust for it find the stability benefit more robust than the behavioral and academic benefits, which are mixed.
For adolescents in out-of-home care, congregate (group/residential) placement is associated with worse outcomes than family-based foster care — including roughly 2.5 times the risk of delinquency in matched samples, worse behavioral outcomes meta-analytically, and more criminal referrals than treatment foster care in a randomized trial — though selection of higher-risk youth into congregate settings accounts for part of the difference, and the association is weakest for youth who were already delinquent.
Most adopted children develop within the normal range, but as a group adoptees show a modestly elevated risk of emotional, behavioral, and mental-health difficulties relative to non-adopted peers in intact biological families; risk rises with later age at placement and pre-adoption adversity, and adoption itself is a strongly beneficial intervention relative to remaining institutionalized.
Parental substance use disorder is a moderate risk factor for child maltreatment and for worse developmental, behavioral, and mental-health outcomes, operating largely through impaired, inconsistent, or disengaged caregiving; the risk is graded by severity of use and substance type, is confounded by co-occurring adversity, and substance use alone does not establish maltreatment or parental unfitness.
Youth who age out of foster care at the age of majority face markedly elevated risks of homelessness, poverty, and educational and employment shortfalls in early adulthood; remaining in extended foster care past 18 is associated in state-level policy and longitudinal studies with substantially reduced homelessness, though one national prospective study finds no protective effect of extended care or independence services.
Parental incarceration is associated with worse child outcomes — particularly antisocial behavior and, into young adulthood, anxiety, substance-use disorder, and reduced educational attainment — but the most rigorous studies, which control for pre-existing antisocial behavior and shared genetic/family confounding, find the independent effect is smaller and uneven across domains; paternal-incarceration effects are better supported than maternal, and much of the raw association reflects selection.
Placing siblings together in out-of-home care is best practice and federal policy and is associated with greater placement stability, but the evidence that co-placement improves child well-being is mixed and confounded; the benefit appears to track sibling-relationship quality more than co-placement itself, and separation can be appropriate when one sibling endangers another.
Whether placing a maltreated child in foster care produces better or worse outcomes than leaving the child at home is genuinely unresolved: rigorous quasi-experiments using the same identification strategy reach opposite conclusions, effects apply only to "marginal" cases at the placement threshold, and the science supports neither a presumption for nor against removal.