From a December 2012 Bureau of Justice Statistics brief by Nicole White and Janet L. Lauritsen:
From 1994 to 2010, youth living with an unmarried head of household were generally more likely than youth living with a married head of household to be victims of violent crime. During this period, the decline in serious violent crime was greater for youth in married households (down 86%) than the decline among youth in unmarried households (down 65%).
Categories: Marriage
I would guess this is linked to neighborhoods they live in due to income. Reminds me of the book the two income trap.
Mother Jones has been publishing some very compelling articles on the reduction of crime linked to the elimination of lead paint.