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.