Group

前

后

t

P

0-back1

381.02 ± 181.93

377.54 ± 100.74

0.203

0.839

0-back2

482.31 ± 29.13

471.97 ± 39.65

2.564

0.011^*

1-back1

362.83 ± 125.09

408.42 ± 158.57

−2.718

0.007^*

1-back2

456.03 ± 80.00

497.85 ± 71.51

−4.757

0.000^*

2-back1

457.51 ± 292.37

591.89 ± 311.26

−3.505

0.001^*

2-back2

482.21 ± 122.47

642.61 ± 227.26

−7.539

0.000^*