Table 5 Comparison of RI among four groups

T0

0.37 ± 0.24

0.37 ± 0.28

0.39 ± 0.18

0.35 ± 0.21

0.218

0.884

T1

0.38 ± 0.26

0.32 ± 0.18

0.37 ± 0.17

0.32 ± 0.18

2.210

0.092

T2

0.36 ± 0.20

0.31 ± 0.14

0.37 ± 0.17

0.30 ± 0.10

2.050

0.109

T3

–

–

–

–

T4

1.21 ± 0.53^#

0.94 ± 0.59^#a

0.96 ± 0.49^#a

0.74 ± 0.33^#bcd

6.620

 < 0.001

T5

1.08 ± 0.73^#

0.78 ± 0.64^#a

0.78 ± 0.48^#a

0.67 ± 0.44^#b

3.999

0.009

T6

0.87 ± 0.93^#

0.59 ± 0.39^#

0.65 ± 0.74^#

0.47 ± 0.50^#

2.237

0.089