The mean, standard deviation, and range of NU scores of OUD and HC subjects are listed in Table 1. OUD subjects scored significantly higher in NU than HC subjects (t=2.70, df=48, p=0.010). The proportions of OUD subjects with severe, moderate, and mild OUD are listed in Table 2. The median, interquartile range (IQR), and range of hours since last opioid use are listed in Table 2.