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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
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