An electrochemical breath alcohol analyzer, the BACtrack® Mobile Pro (BACtrack Breathalyzers, San Fransisco, California, USA) was used to measure BrAC  \cite{Riordan2017-vl,Olson2021-jd,Delgado_2021}. Accuracy checks were performed with the breath alcohol analyzer prior to use at reference vapors of 0.007, 0.065, 0.080, and 0.162 g/210L (g/dl blood alcohol [BAC] equivalent). Results fell within 0.002 g/210L of reference standards.

Results

The mean time-to-peak BrAC was 33-minutes, while the mean time-to-peak TAC was 60-minutes. The relationship between TAC/BrAC for all measurements (n=43) revealed an R2 of 0.65. A scatterplot of the relationship is shown in figure \ref{710097}. The TAC/BrAC relationship during the 45-minute post-drinking phase (n=37) revealed an R2 of 0.89. Figure \ref{823643} shows a scatterplot of the TAC/BrAC relationship in the post-45-minute drinking time period.
Figure \ref{931124} shows a line graph plotting the TAC/BrAC measurements taken over an 8 hour period.