After the 10-day treatment , symptom scores of the Xuan Bai Cheng Qi group were significantly lower over time compared with the control group ( FAS : mean difference -1.84 , 95 % CI -2.66 to -1.03 , P < .001 ; PPS : mean difference -1.87 , 95 % CI -2.71 to -1.03 , P < .001 ) .