Table 2 The main measurements of paraspinal muscles

 Preoperative

1557.51 (1277.39, 1856.21)

1566.77 (1305.55, 1930.76)

− 0.094

0.925

 Final follow-up

1432.54 (1105.15, 1718.53)

1512.38 (1278.10, 1970.32)

− 1.176

0.239

 Percentage change (%)

− 10.1 (− 11.8, − 7.5)

− 1.3 (− 3.0, 0.2)

− 7.442

< 0.001

 Preoperative

471.07 (404.33, 532.65)

466.52 (385.81, 579.83)

− 0.550

0.583

 Final follow-up

529.31 (438.12, 597.54)

476.34 (402.25, 587.29)

− 1.221

0.222

 Percentage change (%)

10.6 (5.3, 16.7)

1.4 (− 2.3, 4.1)

− 5.675

< 0.001

 Preoperative

3.38 ± 0.89

3.30 ± 0.88

0.412

0.681

 Final follow-up

2.71 ± 0.72

3.23 ± 0.85

− 2.933

0.004

 Percentage change (%)

− 19.2 (− 23.0, − 15.0)

− 2.5 (− 6.3, 0.5)

− 7.738

< 0.001