In a single day last week, juries deliberating 200 miles apart in Pennsylvania delivered guilty verdicts against Jerry Sandusky, a former assistant football coach at Penn State, for sexually molesting boys, and against Msgr. William J. Lynn, a clergy secretary, for shielding predatory priests. In New York, accusations of sexual abuse at Horace Mann, an exclusive preparatory school in the Bronx, recently spurred two law enforcement agencies to open hot lines and an 88-year-old former teacher at the school to admit to having had sexual interactions with students decades ago
But if the convictions of Mr. Sandusky and Monsignor Lynn represent a success story, the furor surrounding them tends to obscure what may be an even more significant achievement, albeit one that receives little publicity: The rates of child sexual abuse in the United States, while still significant and troubling, have been decreasing steadily over the last two decades by several critical measures.
Overall cases of child sexual abuse fell more than 60 percent from 1992 to 2010, according to David Finkelhor, a leading expert on sexual abuse who, with a colleague, Lisa Jones, has tracked the trend. The evidence for this decline comes from a variety of indicators, including national surveys of child abuse and crime victimization, crime statistics compiled by the F.B.I., analyses of data from the National Data Archive on Child Abuse and Neglect and annual surveys of grade school students in Minnesota, all pointing in the same direction.