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Table 2: Comparative distribution of spinal segment variants
Spinal Segment Variant Overall (n = 450) Women (n = 279) Men (n = 171) P Value^{^a}
Spinal segment distribution variant^{^b} 107 (23.8%) 71 (25.4%) 36 (21.1%) .343
Cervical rib 19 (4.2%) 13 (4.7%) 6 (3.5%) .728
TLTV 69 (15.3%) 36 (12.9%) 33 (19.3%) .091
LSTV 119 (26.4%) 60 (21.5%) 59 (34.5%) .003
↵a Result of the χ² test for the difference between frequencies of spinal segment variants by sex.
↵b An atypical number of presacral segments or an atypical distribution of thoracolumbar vertebrae.

Spinal Segment Variant	Overall (n = 450)	Women (n = 279)	Men (n = 171)	P Value^{^a}
Spinal segment distribution variant^{^b}	107 (23.8%)	71 (25.4%)	36 (21.1%)	.343
Cervical rib	19 (4.2%)	13 (4.7%)	6 (3.5%)	.728
TLTV	69 (15.3%)	36 (12.9%)	33 (19.3%)	.091
LSTV	119 (26.4%)	60 (21.5%)	59 (34.5%)	.003