Fig. 2.

Plasma OXT concentrations predict (A) NEPSY theory of mind and (B) Vineland Communication Domain scores independent of group. Groups and sample sizes are detailed in Fig. 1. In A and B the intercepts (i.e., the mean phenotypic scores) differ significantly by group (P < 0.05), whereas the slopes of the lines do not. The overall regression line averaged across groups is significant. The phenotypic data corrected for other variables in the analysis is shown, and each line is plotted between the full extents of the data. Data points are presented as LSM ± SEM for each quintile of the data, ordered by OXT concentrations within each group.