As for main indicators , the score of YGTSS decreased from 22.10 + / - 6.38 to 11.34 + / - 6.58 in the test group , while it decreased from 22.65 + / - 6.70 to 16.82 + / - 6.53 in the control group , showing statistical difference when compared with the same group before treatment ( P < 0.01 ) .