Table 4.

Association of rod fracture risk with postoperative characteristics

Confounders	Subgroups	Rod(s) fracture		Odds ratio (95 % Cl: min; max)	P(χ 2)
		Yes	No
Postoperative sagittal imbalance	≥50 mm	3	22	1.5 (0.3; 8.1)	>0.5
	<50 mm	3	33
Postoperative coronal imbalance	≥30 mm	2	16	1.2 (0.2; 7.1)	>0.5
	<30 mm	4	38
Postoperative lumbar lordosis (LL)	<49°	4	21	2.5 (0.5; 12.4)	0.3
	≥49°	3	40
Postoperative thoracic kyphosis	≥40°	3	33	0.5 (0.1; 2.6)	0.5
	<40°	4	23
Postoperative pelvic incidence (PI)	<42°	2	11	1.8 (0.3; 11.0)	>0.5
	≥42°	4	39
Postoperative PI-LL	>10°	1	16	0.4 (0.04; 3.3)	0.4
	≤10°	5	28
Postoperative pelvic tilt	≤20	4	27	1.9 (0.3; 11.4)	0.5
	>20	2	26
Postoperative coronal Cobb angle	<25°	7	54	N/A	0.4
	≥25°	0	14
Pseudarthrosis at ≥1 year follow-up	Yes	4	3	28.9 (4.4; 191.7)	<0.001
	No	3	65