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Table 4 Incidence of ossified lesion 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)

  1. low more significant different (0.01 < p < 0.05)
  2. moderate more significant different (0.001 < p < 0.01)
  3. high more significant different (p < 0.001)