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

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