Past-year exposure in adolescents. Plots show point prevalence (squares), 95% CIs (horizontal lines), summary prevalence and 95% CIs for each region and overall (diamonds, the width of which represents the 95% CIs), and summary prevalence estimate (dotted line). Records are listed by date of publication and then by date of data collection. (See eTable 1 in the Supplement for full citations and descriptions.) CDC indicates Centers for Disease Control and Prevention; CER, Centre for Epidemiology and Research; NCI, National Cancer Institute; NSW, New South Wales.