RAINN's count of pregnancies is based on Justice's victimization survey from 2004-05, in part because the CDC's survey has a smaller sample size, says Scott Berkowitz, RAINN's president and founder.

WSJ: Pregnancies From Rape Prove Tough to Count

The Pew study chiefly used federal data from the federal Centers for Disease Control and Prevention, and the Justice Department's National Crime Victimization Survey, a household survey conducted by the Census Bureau.

NPR: Reports Show Gun Homicides Down Since 1990s