Figure 1.

Comparison trips with adverse driving plotted against the apnea–hypopnea index (AHI) and grouped by biomarker status. Greater AHI results in increased mean number of trips with adverse driving behavior in both groups, although the mean number of adverse driving events was lower for the biomarker negative group. Note: To increase legibility of the plots two outliers have been excluded from the data. These participants were included in the data used to construct the statistical models as they did not meet any a priori exclusion criteria.