Table 4 The results of ASIA and JOA scores under the interaction between the surgical timing and the number of the fused segments

ASIA score

Postop. 1 month

64.14 ± 8.43

61.97 ± 7.91

60.38 ± 8.06

58.61 ± 7.83

63.97 ± 9.07

62.01 ± 8.75

Postop. 6 months

84.56 ± 10.22

76.41 ± 11.37^a

81.74 ± 9.84

73.85 ± 10.08^a

69.85 ± 8.01

70.34 ± 7.82

Postop. 12 months

86.22 ± 11.37

76.93 ± 10.24^a

84.24 ± 9.37

74.63 ± 8.87^a

70.72 ± 7.94

69.91 ± 8.27

Postop. 24 months

87.37 ± 8.98

78.15 ± 10.77^a

86.04 ± 9.11

75.06 ± 9.68^a

72.14 ± 8.27

71.48 ± 9.06

JOA score

Postop. 1 month

9.95 ± 1.96

9.82 ± 2.07

9.75 ± 1.73

9.82 ± 1.47

9.83 ± 1.47

10.06 ± 2.14

Postop. 6 months

12.11 ± 1.59

11.03 ± 1.75^a

11.81 ± 1.60

10.36 ± 1.52^a

11.17 ± 1.75

10.94 ± 1.69

Postop. 12 months

13.83 ± 1.88

12.32 ± 2.01^a

13.06 ± 1.94

11.90 ± 1.87^a

12.41 ± 2.01

12.05 ± 1.77

Postop. 24 months

14.25 ± 1.66

13.17 ± 1.42^a

14.42 ± 1.932

12.78 ± 1.88^a

12.91 ± 1.82

12.17 ± 1.90