Other social studies put the total amount of Whites at over 60 percent.

Other studies have put the lifetime costs at $40,000 to $75,000.

The study put the cost of installing a system in a 1,000-occupant building at about $52,000.

But studies over the years have put the figure at 4 to 15 percent.

A 2010 study put the death toll at between 500 and 700.

Various studies put the national graduation rate for black college students at 26 to 42 percent, according to the report.

One study put the portion of women involved at just 2.3 percent.

Other studies, based on projections, put the cost at about $3 a year.

Other studies of young adults put the figure above 20 percent.

Other studies put awareness at between 49 to 69 percent.