Shown in Table 2 are prevalence rates for the prior 12-month period and N by Grade for first alcohol use, any alcohol use, and also average volume of use (untransformed), which included zero use (i.e., nonusers). Just over one half of the sample indicated alcohol use at Grade 6, and the prevalence rate increased over time to 84% by Grade 12. Similarly, the volume of alcohol used increased substantially over time, with large yearly increases from Grades 8 through 11, in particular.
