“Perpetrator’s relationship to the child. The majority of all children countable under the Harm Standard (81%) were maltreated by their biological parents. This held true both for the abused children (64% were abused by biological parents) and for those neglected (92% were neglected by biological parents).
Biological parents were the most closely related perpetrators for 71% of physically abused children and for 73% of emotionally abused children. The pattern was distinctly different for sexual abuse. More than two-fifths (42%) of the sexually abused children were sexually abused by someone other than a parent (whether biological or nonbiological) or a parent’s partner, whereas just over one-third (36%) were sexually abused by a biological parent. In addition, severity of harm from physical abuse varied by the perpetrator’s relationship to the child. A physically abused child was more likely to sustain a serious injury when the abuser was not a parent.”
But that still does not take into account that the vast majority of children live with their biological parents.
If those numbers were adjusted for the respective groups representation in the population you'd see the real picture
And why do you think it's hard to find studies like that?
Because no one thought of studying it?
Or because of political interests preventing such studies?
“Perpetrator’s relationship to the child. The majority of all children countable under the Harm Standard (81%) were maltreated by their biological parents. This held true both for the abused children (64% were abused by biological parents) and for those neglected (92% were neglected by biological parents). Biological parents were the most closely related perpetrators for 71% of physically abused children and for 73% of emotionally abused children. The pattern was distinctly different for sexual abuse. More than two-fifths (42%) of the sexually abused children were sexually abused by someone other than a parent (whether biological or nonbiological) or a parent’s partner, whereas just over one-third (36%) were sexually abused by a biological parent. In addition, severity of harm from physical abuse varied by the perpetrator’s relationship to the child. A physically abused child was more likely to sustain a serious injury when the abuser was not a parent.”
http://cap.law.harvard.edu/wp-content/uploads/2015/07/sedlaknis.pdf Page 19 of the pdf.
Alright, so sexual abuse is perpetrated less by a biological parent, but physical abuse is most likely perpetrated by a biological parent.
But that still does not take into account that the vast majority of children live with their biological parents. If those numbers were adjusted for the respective groups representation in the population you'd see the real picture