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Table 3: Association among spinal segment variants
Cervical Rib TLTV ILL^{^a} LSTV
OR (95% CI), P Value OR (95% CI), P Value OR (95% CI), P Value OR (95% CI), P Value
ILL^{^a} – – – 2.10 (0.79–5.31), .121
TLTV – – 1.50 (0.42–4.29), .482 1.87 (1.08–3.20), .023
Cervical rib – 2.70 (0.92–7.09), .053 4.86 (1.06–16.54), .020 3.28 (1.29–8.47), .012
Spinal segment distribution variant^{^b} 2.44 (0.92–6.19), .062 66.13 (30.34–166.85), <.001 3.06 (1.18–7.80), .018 5.47 (3.43–8.80), <.001
Note:—The en dash indicates duplicate entries.
↵a Inability to visualize iliolumbar ligament.
↵b An atypical number of presacral segments or an atypical distribution of thoracolumbar vertebrae.

	Cervical Rib	TLTV	ILL^{^a}	LSTV
	OR (95% CI), P Value	OR (95% CI), P Value	OR (95% CI), P Value	OR (95% CI), P Value
ILL^{^a}	–	–	–	2.10 (0.79–5.31), .121
TLTV	–	–	1.50 (0.42–4.29), .482	1.87 (1.08–3.20), .023
Cervical rib	–	2.70 (0.92–7.09), .053	4.86 (1.06–16.54), .020	3.28 (1.29–8.47), .012
Spinal segment distribution variant^{^b}	2.44 (0.92–6.19), .062	66.13 (30.34–166.85), <.001	3.06 (1.18–7.80), .018	5.47 (3.43–8.80), <.001