Prevalences of sociodemographic variables in this sample have been reported previously, and are representative of the 2000 US census population.54 Before age 11, 36% of participants had experienced at least one PTE, 23% reported only one type of PTE, 8% reported two, and 4% reported three or more (Table 1). Before the age of 11, 11% of participants had experienced interpersonal violence, 18% a traumatic accident, 15% had witnessed or heard about a traumatic event happening to a loved one, and 4% reported an unspecified event. For lifetime drug use, 22% had ever used marijuana, 2% cocaine, 5% prescription drugs not for medical reasons, 3% other drugs, and 6% multiple drugs.
