v a ms. forma nvest gat ons conducted us ng per od from 1998 to rates ncreased as ch dren grew o den Ana yses on y nvo ved cases that standard zed NICHD 2002. 140 exper enced 50% w th 3- to 6-yearn ds. 67% of the 7- had come to the attent on of Invest gat ve Intery ew tra ned youth to I0-year-o ds.