Overall, a relatively poor level of agreement was found between individual-level self-reported volume and BAC for both the empirical estimates and those derived from the Widmark equation. This was found even when the sample was again restricted to those arriving to the ER within three hours of their injury for which, due to the restriction on elapsed time, it might be argued that factors that may be associated with the heterogeneity of results (e.g., drinking with food vs. not, highly differential physiological processing of ethanol) would be minimized.
