The results for withdrawal severity, as measured by MNWS and BQSU, are summarized in Table 2 and Figure 3. The NMR values were positively correlated with the MNSW and BQSU factor 1 scores (p<0.05). For the PANAS, neither a main effect of genotype nor a genotype × session interaction was found to influence positive and negative affect states (p>0.05).