Table 2 The left and right pressures under different loading conditions in the unfixed and fixed groups (MPa)

1.22 ± 0.25

1.39 ± 0.23

1.44 ± 0.24

1.23 ± 0.18

1.30 ± 0.17

1.30 ± 0.28

1.46 ± 0.18

1.52 ± 0.25

1.32 ± 0.20

1.27 ± 0.21

1.05 ± 0.13^a

0.59 ± 0.10^a,b

0.45 ± 0.08^a,b

0.75 ± 0.18^a,b

0.76 ± 0.13^a,b

1.46 ± 0.35

1.14 ± 0.12

0.81 ± 0.11

1.16 ± 0.16

1.53 ± 0.28

1.43 ± 0.24

1.68 ± 0.23

1.48 ± 0.30

1.47 ± 0.12

1.12 ± 0.25

1.49 ± 0.32

1.41 ± 0.31

1.53 ± 0.22

1.56 ± 0.32

1.00 ± 0.15

1.04 ± 0.14^b

0.63 ± 0.11^a,b

0.51 ± 0.07^a,b

0.60 ± 0.08^a,b

0.73 ± 0.06^a,b

1.22 ± 0.14

1.31 ± 0.29

0.72 ± 0.07

0.86 ± 0.07

1.36 ± 0.29

0.93 ± 0.03

1.70 ± 0.29

1.41 ± 0.30

0.91 ± 0.13

1.48 ± 0.28

1.01 ± 0.16

1.86 ± 0.22

1.65 ± 0.25

1.02 ± 0.18

1.34 ± 0.24

1.26 ± 0.23^b

0.44 ± 0.07^{a, b}

0.65 ± 0.12^b

0.67 ± 0.14^a,b

0.68 ± 0.11^a,b

1.39 ± 0.27

1.35 ± 0.20

0.82 ± 0.11

1.32 ± 0.20

1.36 ± 0.23

1.70 ± 0.18^c,d

1.79 ± 0.14^c,d

1.84 ± 0.22^c,d

1.74 ± 0.28^c,d

1.60 ± 0.23^c,d

0.83 ± 0.12

0.93 ± 0.12

0.50 ± 0.05

0.60 ± 0.10

0.55 ± 0.08