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Table 1 Patient demographics and screw position

From: Does a deep seated L5 vertebra position with respect to the iliac crests affect the accuracy of percutaneous pedicle screw placement at lumbosacral junction?

Variable L5-S group L5-NS group P
Patient no. 34 20 -
 Male (%) 18 (52.9%) 8 (40.0%) 0.358
 Female (%) 16 (47.1%) 12 (60.0%)
 Mean age (y) 51.7 ± 12.7 46.6 ± 11.8 0.514
 BMI (kg/m2) 25.7 ± 6.7 26.5 ± 7.1 0.482
Screw no. 136 80 -
 Grade 0 (%) 101 (74.3%) 61 (76.3%) 0.886
 Grade 1 (%) 25 (18.4%) 14 (17.5%)
 Grade 2 (%) 9 (6.6%) 5 (6.3%)
 Grade 3 (%) 1 (0.7%) 0 (0.0%)