To describe the prevalence of binge drinking, the CDC analyzed data from its 2011 Behavioral Risk Factor Surveillance System, an annual telephone survey, and the national 2011 Youth Risk Behavior Survey, an anonymous questionnaire completed by high school students nationwide.

CNN: CDC: 1 in 5 high school girls binge drink

Conducted by the Northern Ireland Statistics and Research Agency, the survey involved a self-completion questionnaire given to more than 6, 000 post-primary school children in 62 schools.

BBC: Report highlights pupils' attitudes