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Table 1 Comparison of each index between the two groups

From: Multivariate analysis of pedicle screw invasion of the proximal facet joint after lumbar surgery

Index Number of cases Invasion group (724 cases) Noninvasion group (497 cases) χ2 P
Sex     0.113 0.390
 Male 612 360 252   
 Female 609 364 245   
Age     60.441 0.000
  < 50 481 230 251   
  ≥ 50 740 504 236   
BMI     71.745 0.000
  < 24 kg/m2 393 211 182   
 24 ~ 28 kg/m2 330 149 181   
  > 28 kg/m2 498 364 134   
Bone mineral density     1.020 0.322
  > −2.5 615 356 259   
  ≤ −2.5 606 368 238   
Proximal facet joint angle     117.078 0.000
  < 35° 460 183 277   
 35 ~ 45° 501 351 150   
  > 45° 260 190 70   
Degenerative lumbar spondylolisthesis     47.921 0.000
 No 550 268 282   
 Yes 671 456 215   
Isthmic lumbar spondylolisthesis     114.587 0.000
 No 370 133 237   
 Yes 851 591 260   
Fixed segment     33.220 0.000
 Upper lumbar 163 63 100   
 Lower lumbar 1058 661 397