The PEDT scores of the three groups were 5.1 1.8 , 4.9 1.7 , and 3.8 1.2 after treatment and 8.2 2.4 , 8.1 2.4 , and 6.5 2.1 at 1 month after drug withdrawal , significantly improved in comparison with 13.2 3.2 , 12.8 3.1 , and 13.1 3.4 before treatment ( P < 0.01 ) , even more significantly in group C than in A and B ( P < 0.01 ) .