Both critics and supporters of the CDC’s methodology note the striking disparity between CDC figures and the Justice Department’s crime statistics based on the National Crime Victimization Survey (which includes crimes unreported to the police). While the CDC estimates that nearly 2 million adult American women were raped in 2011 and nearly 6.7 million suffered some other form of sexual violence, the NCVS estimate for that year was 238,000 rapes and sexual assaults.
New Republic reporter Claire Groden points out that while the NCVS focuses on criminal acts, the CDC’s National Intimate Partner and Sexual Violence Survey asks about instances of forced sex which respondents may or may not regard as crimes. Yet it is worth noting that in the early 1990s, the NCVS was redesigned to elicit more reports of sexual and domestic violence that may not fit the conventional mold of criminal attacks. In addition to being asked directly about rape, attempted rape or sexual assault, respondents now get a follow-up question about “forced or unwanted sexual acts” committed by a stranger, a casual acquaintance, or someone they know well.