Several interesting results emerged from our efforts to characterize the disorders and personality traits that best reflected these two genetic spectra. First, contrary to expectations, psychiatric and drug use disorders consistently outperformed personality traits as indices for these genetic common factors. The two best-performing personality traits were N for the internalizing spectra (which had the third highest loading in males and the fifth in females) and NS for the externalizing spectra (which had the fourth highest loading in females but the ninth in males, behind N). If we consider instead the percentage of heritability shared with the genetic common factors, the results are similar.
