Table 3.

Multivariable regression analysis for early and late reoperation

Variables	Early reoperation		Late reoperation
	Odds ratio (95% CI)	P	Odds ratio (95% CI)	P
Age	1.0 (0.9–1.0)	0.77	–	–
Weight	–	–	0.9 (0.9–1.0)	0.12
BMI	–	–	1.0 (0.8–1.1)	0.84
Operative time	1.0 (0.9–1.0)	0.15	1.0 (0.9–1.0)	0.94
Osteoporosis	3.6 (1.2–10.5)	0.02	–	–
Diabetes	2.1 (1.1–4.5)	0.04	–	–
Surgical history	1.5 (0.3–4.3)	0.22	–	–
Fused levels > 2	1.3 (0.5–3.1)	0.51	2.4 (1.1–5.4)	0.03
EBL	–	–	1.0 (0.9–1.0)	0.43

Bold font indicates statistical significance

BMI, body mass index; EBL, estimated blood loss