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Table 1 Comparison of patient characteristics between the good group and poor group

From: Predictors of poor outcome in cervical spondylotic myelopathy patients underwent anterior hybrid approach: focusing on change of local kyphosis

Variables

Good (n = 66)

Poor (n = 20)

p value

Age at surgery (years)

57.1 ± 8.8

63.4 ± 9.2

< 0.001

Female, n (%)

35 (53%)

11 (55%)

0.877

BMI (kg m−2)

23.5 ± 3.6

24.6 ± 4.1

0.309

Duration of symptoms (months)

11.6 ± 7.5

16.3 ± 11.8

0.002

T1 slope (°)

14.3 ± 2.4

17.8 ± 3.2

0.001

C2–7 SVA (mm)

17.6 ± 10.2

19.1 ± 9.4

0.266

Involved levels, n (%)

  

0.762

 C2–5

13 (19.7%)

4 (20%)

 

 C3–6

31 (47%)

11 (55%)

 

 C4–7

22 (33.3%)

5 (25%)

 

JOA score

 Preoperative

8.1 ± 2.2

7.5 ± 2.6

0.641

 Postoperative

12.1 ± 3.7

10.9 ± 3.3

0.131

 Last follow-up*

14.3 ± 2.9

10.1 ± 1.5

< 0.001

 Recovery rate, %

64.7 ± 18.3

34.9 ± 10.5

< 0.001

C2–7 ROM (°)

38.2 ± 12.7

39.5 ± 13.0

0.891

C2–7 Cobb (°)

 Preoperative

− 10.7 ± 5.5

− 11.3 ± 6.2

0.219

 Postoperative

7.1 ± 4.4

6.9 ± 5.0

0.774

 Last follow-up

6.3 ± 5.7

5.6 ± 4.9

0.428

 Change of C2–7 (pre and last)

12.4 ± 8.7

13.1 ± 9.5

0.138

LKA (°)

 Preoperative

− 13.7 ± 10.5

− 11.3 ± 9.2

0.736

 Postoperative

5.1 ± 7.2

4.8 ± 6.3

0.552

 Last follow-up

5.6 ± 3.9

0.3 ± 5.4

0.003

 CLA (pre and last)

12.1 ± 7.7

8.7 ± 6.5

< 0.001

WPLA, n (%)

10 (15.1%)

7 (35%)

0.032

Implant subsidence > 3 mm, n (%)

6 (9%)

2 (10%)

0.817

  1. Abbreviations: BMI body mass index, T1 thoracic 1, SVA sagittal vertical axis, JOA Japanese Orthopaedic Association, ROM range of motion, LKA local kyphosis angle, CLA change of local angle, WPLA worsening of postoperative local alignment
  2. *Significantly different from preoperative JOA score (p < 0.05)