Table 5.

Association of CSRF risk with variables showing increased risk with P ≤ 0.2

Confounders	Subgroups	CSRF fracture		Odds ratio (95 % Cl: min; max)	P(χ 2)
		Yes	No
Screw density	Incompletea	3	28	4.6 (0.5; 46.5)	0.2
	Complete	1	43
Sagittal rod contour	>60°	3	21	7.1 (0.7; 72.7)	0.1
	≤60°	1	50
Crosslinks	≥2	2	14	4.1 (0.5; 31.5)	0.2
	0–1	2	57
Domino and/or parallel connectorsa	Yes	2	10	6.1 (0.8; 48.4)	0.1
	No	2	61
Number of crossing junctions	2	3	30	4.1 (0.4; 41.4)	0.2
	0–1	1	41
Fusion to sacrum	Yes	4	41	N/A	0.2
	No	0	30
Fusion to pelvis	Yes	4	20	N/A	0.05
	No	0	51
Pseudarthorsis at	Yes	3	4	50.3 (4.2; 598.8)	<0.01
≥1 year follow-up	No	1	67

^aMissing one or more pedicle screws at available locations along construct