Below 7 drinks, the aggregated BAC and self-report appears to show a rather strong relationship. However, above a self-reported volume of about 7 drinks, the empirical plot of BAC vs. volume suggested a weak relationship between the two measures. While this could possibly reflect the (extended) length of time from drinking to BAC measurement, findings were similar when analysis was restricted to those arriving to the ER (and having a BAC estimate) within 3 hours of the injury event. Note that, as seen in Figure 1, a number of individuals reported a very large number of drinks (up to 60). Analyses were also performed removing all individuals who reported consuming from than 30 drinks (results not shown) and very similar results were found for model parameter estimates and resulting estimated volumes.
