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Table 1 Demographic Data

From: Intraoperative electromyographic monitoring to optimize safe lumbar pedicle screw placement – a retrospective analysis

Variables Group 1 Group 2
No. of patients n = 296 [Male = 106; Female = 190] n = 222 [Male = 80; Female = 142]
Age 64.2 ± 11.7 years 62.9 ± 11.3 years
Total No. of pedicle screws 1856 1256
No. of screws per patient 6.3 ± 2 5.6 ± 2
No. of screws in L1 40 14
No. of screws in L2 162 64
No. of screws in L3 384 196
No. of screws in L4 542 396
No. of screws in L5 548 432
No. of screws in S1 180 154