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Table 2 Comparison between preoperative and postoperative JOA scores in four institutions (A–D)

From: Are clinical outcomes affected by laminoplasty method and K-line in patients with cervical ossification of posterior longitudinal ligament? A multicenter study

Variables

A (ODL)

B (ODL)

C (ODL)

D (mFDL)

Median (IQR)

Z value

P value

Median (IQR)

Z value

P value

Median (IQR)

Z value

P value

Median (IQR)

Z value

P value

Pre-JOA score

11.0 (9.0–13.0)

− 5.163

< 0.001

15.0 (12.0–16.0)

− 2.471

0.013

10.0 (8.0–11.5)

− 2.788

0.005

9.0 (8.0–12.5)

− 6.709

< 0.001

Post-JOA score

14.0 (12.0–16.0)

  

16.5 (12.0–17.0)

  

12.0 (11.0–15.5)

  

15.0 (14.0–16.0)

  
  1. JOA Japanese Orthopaedic Association, ODL open-door laminoplasty, mFDL modified French-door laminoplasty, IQR interquartile range
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Journal of Orthopaedic Surgery and Research

ISSN: 1749-799X