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Table 3 Difference analytical results of OPLL and Non-OPLL groups

From: Multivariate analysis of factors associated with spinal cord area in single-door cervical laminoplasty with miniplate fixation

  Total OPLL Non-OPLL P value
The preoperative SCD, cm 1.64 ± 0.15 1.62 ± 0.13 1.65 ± 0.17 0.479
The preoperative C2–7 Cobb angle, ° 12.2 ± 8.6 13.9 ± 7.5 11.7 ± 8.9 0.342
The preoperative CCI 0.09 ± 0.10 0.13 ± 0.09 0.08 ± 0.10 0.038
The preoperative spinal canal area, mm2 191 ± 33 186 ± 31 202 ± 38 0.135
The preoperative ROM, ° 43.7 ± 11.6 43.2 ± 10.7 44.0 ± 11.8 0.275
The preoperative spinal cord area, mm2 98 ± 46 92 ± 44 97 ± 50 0.695
Door shaft position (wide: narrow) 38:45 9:10 29:35 0.876
Blood loss, ml 236 ± 177 224 ± 189 239 ± 174 0.745
Operative time, min 147 ± 38 144 ± 43 147 ± 37 0.757
Postoperative drainage volume, ml 270.0 ± 130.3 250.0 ± 123.1 273.0 ± 117.0 0.459
  1. OPLL posterior longitudinal ligament, SCD sagittal canal diameter, CCI cervical curvature index, ROM range of motion