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Table 1 Demographics of male and female patients

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)

  Male + Female (n = 322) Male (n = 242) Female (n = 80) P (M vs F)
Age (years old) 64.7 ± 11.2 64.7 ± 11.6 64.6 ± 10.0 0.90
Diabetes Mellitus (%) 31.7% 31.8% 31.3% 0.92
BMI 25.7 ± 4.8 25.8 ± 4.8 25.5 ± 4.7 0.62
JOSL CT classification
 Grade 1 (1 < cervical OP-index≤5) 169 (52.5%) 125 (51.7%) 44 (55%)
 Grade 2 (6 < cervical OP-index ≤9) 107 (33.2%) 83 (34.3%) 24 (30%)
 Grade 3 (10 < cervical OP-index) 46 (14.3%) 34 (14.0%) 12 (15%)
Cervical OP-index 5.83 ± 2.9 5.86 ± 2.9 5.75 ± 3.0 0.78
OP-index 9.21 ± 6.8 8.24 ± 5.5 12.1 ± 9.0 < 0.01
No. of patients with OP-index of > = 20 (%) 27 (8.3%) 11 (4.5%) 16 (20%) < 0.01
  1. Data are expressed as the mean ± standard deviation; BMI body mass index, OP-index ossification index of OPLL