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Table 5 Increased risk of OPLL in each level according to cervical OP-index grading system

From: Distribution of ossified spinal lesions in patients with severe ossification of the posterior longitudinal ligament and prediction of ossification at each segment based on the cervical OP index classification: a multicenter study (JOSL CT study)

Grade 1+

Male

Female

Segment

Odds ratio

p

Odds ratio

p

T1

5.0

0

4.5

0

T1–2

3.2

0

3.5

0.001

T2

4.3

0

3.1

0.003

T2–3

2.5

0.001

3.1

0.002

T3

3.3

0.005

3.7

0.001

T3–4

2.1

0.004

2.6

0.006

T4

–

0.07

2.3

0.027

T4–5

–

0.133

4.3

0

T5

–

0.12

–

0.111

T5–6

–

0.24

2.4

0.01

T6

6.5

0.013

2.3

0.034

T6–7

–

0.084

2.0

0.045

T7

–

0.077

–

0.169

T7–8

–

0.089

–

0.075

T8

–

0.09

–

0.123

T8–9

–

0.078

3.1

0.003

T9

–

0.104

–

0.312

T9–10

–

0.359

2.3

0.027

T10

–

0.25

–

0.234

T10–11

–

0.628

2.2

0.043

T11

5.0

0.036

–

0.153

T11–12

2.7

0.001

3.1

0.003

T12

3.3

0.023

3.7

0.024

T12-L1

2.0

0.007

3.4

0.001

L1

2.3

0.021

–

0.101

L1–2

2.3

0.006

–

0.08

L2

–

0.07

–

0.465

L2–3

2.7

0

2.1

0.041

L3

5.0

0.036

–

0.189

L3–4

–

0.07

–

0.763

L4

–

0.993

–

0.46

L4–5

–

0.449

–

0.381

L5

–

0.47

–

0.118

L5-S1

–

0.24

–

0.312

S1

5.0

0.993

–

–