In a small study of twenty-two Texan youths who aged out of the system, 23 percent had a history of suicide attempts.A Swedish study utilizing the data of almost one million people including 22,305 former foster children who had been in care prior to their teens, concluded:

Former child welfare clients were in year of birth and sex standardised risk ratios (RRs) four to five times more likely than peers in the general population to have been hospitalised for suicide attempts....Individuals who had been in long-term foster care tended to have the most dismal outcome...former child welfare/protection clients should be considered a high-risk group for suicide attempts and severe psychiatric morbidity. Death rate
Children in foster care have an overall higher mortality rate than children in the general population. A study conducted in Finland among current and former foster children up to age 24 found a higher mortality rate due to substance abuse, accidents, suicide and illness. The deaths due to illness were attributed to an increased incidence of acute and
chronic medical conditions and developmental delays among children in foster care. Georgia Senator Nancy Schaefer published a report "The Corrupt Business of Child Protective Services" stating: "The National Center on Child Abuse and Neglect in 1998 reported that six times as many children died in foster care than in the general public and that once removed to official "safety", these children are far more likely to suffer abuse, including sexual molestation than in the general population".
Therapeutic intervention
Children in the child welfare system have often experienced significant and repeated traumas and having a background in foster homes—especially in instances of sexual abuse—can be the precipitating factor in a wide variety of psychological and cognitive deficits it may also serve to obfuscate the true cause of underlying issues. The foster care experience may have nothing to do with the symptoms, or on the other hand, a disorder may be exacerbated by having a history of foster care and attendant abuses. The human brain however has been shown to have a fair degree of neuroplasticity. and adult neurogenesis has been shown to be an ongoing process.Multidimensional Treatment Foster Care (MTFC), also referred to as Treatment Foster Care Oregon (TFCO) and Treatment Foster Care (TFC) is a community-based intervention that was created in 1983 by Dr. Patricia Chamberlain and her associated colleagues with the initial design intended to offer a replacement for group facilities. MTFC has differing approaches for different age groups. Preschoolers receive “a behavior-management approach and intensively trains, supervises, and supports foster caregivers to provide positive adult support and consistent limit setting” coupled with “coordinated interventions with the child’s biological parents.” MTFC for adolescence consists of individual placement with an intensely trained foster family providing “coordinated interventions in the home, with peers, [and] in educational settings.” MTFC has been shown to provide better results than group facilities and proves to be more cost effective.