https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3784288/
The odds of a reported suicide attempt were ∼4 times greater in adoptees compared with nonadoptees (odds ratio: 4.23). After adjustment for factors associated with suicidal behavior, the odds of reporting a suicide attempt were reduced but remained significantly elevated (odds ratio: 3.70).
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4475346/
Estimates of the percentage of adopted children seen in mental health settings fall within the range of 5-12%9, or 2.5 to 6.0 times the percentage of adopted children in the general population.