Let's not get the statistics confused. The statistics vary according to the age of the child and they vary according to "abducted" and abducted found murdered".
(Ages 1-5) Only 7% of abducted children were abducted by non-family/acquaintances/strangers. 93% were abducted by family.
(Ages 6-11) Only 12% of abducted children were abducted by non-family/acquaintances/strangers. 88% were abducted by family.
(Ages 12-14) 38% of abducted children in this age group are abducted by non-family/acquaintances/strangers. 62% were abducted by family.
(Ages 15-17) 20% of abducted children in this age group are abducted by non-family/acquaintances/strangers. 80% were abducted by family.
Pre-teens and teens are the children that are far more likely to be abducted by nonfamily.
http://www.pollyklaas.org/media/pdf/NISMARTIInonfamily.pdf
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How many children are reported missing each year by the U. S. Department of Justice and found to be a NONFAMILY/STRANGER/BOOGEYMAN abduction?
115
115 children are the victims of stereotypical kidnapping each year. These crimes involve someone the child does not know or a slight acquaintance who holds the child overnight, transports the child 50 miles or more, kills the child, demands ransom, or intends to keep the child permanently.
Source: U.S. Department of Justice National Incidence Studies of Missing, Abducted, Runaway, and Thrownaway Children, 2002
There are approx.
76.1 million children in the USA.
http://www.childstats.gov/americaschildren/tables.asp
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Up until the age of approx 11, family is most likely the offender in a childs homicide.
Filicide, the deliberate act of a parent killing his or her own child, is the third-leading cause of death in American children ages 5 to 14.
https://www.ncjrs.gov/pdffiles1/ojjdp/187239.pdf