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Table 3 Statistical analysis of ODI score before and after operation in the two groups

From: Comparison of degenerative lumbar spondylolisthesis and isthmic lumbar spondylolisthesis: effect of pedicle screw placement on proximal facet invasion in surgical treatment

 

Preoperative ODI score

The ODI score was followed up at 1 month

The ODI scores were followed up at 3 months

ODI score at the last follow-up

F

P

Group A

68(63.5, 74)

56(52, 58)

30(26, 36)

6(4, 26)

1683.740

<0.001

Group B

68(63, 76)

56(50, 60)

28(26, 36)

15(8, 36)

1124.044

<0.001

P

0.724

0.848

0.642

<0.001

  

Z

-0.354

-0.192

-0.465

-8.413

  
  1. Note: ODI preoperative scores of the two groups were compared with those of the 1-month, 3-month and last follow-up ODIs. P value <0.001.