Hypothesizing that it would improve poor GPS in earthquake-related PTSD, we investigated a Chinese herbal formula, XTJYF, modified from a classic formula, Xiao-Yao-San, and found that, compared to placebo, XTJYF significantly improved all of the three global indices of SCl-90-R, and a significantly greater proportion of patients were "much improved" according to changes in GSI score. (See Table 4 and Figure 2) . A subanalysis provided a more detailed look at specific XTJYF effects on poor GPS, showing that five of the nine SCL factors and sleep quality score improved. (see Table 4 ).