Table 3.

Characteristics of non-infected and infected patients.

	Infection Status
	Non-infected		Infected		Total		OR [95% CI]	p-value
	No.	%	No.	%	No.	%
Age (years)	64.46	1.18	62	5.97	64.33	1.15		0.83
BMI (kg/m2)	28.81	0.64	33.74	2.69	29.07	0.63		0.07
Gender
Female (n = 62)	60	66.7	2	40.0	62	65.3	Ref	Ref
Male (n = 33)	30	33.3	3	60.0	33	34.7	3.00 [0.48 - 18.93]	0.24
Total (n = 95)	90	100.0	5	100.0	95	100.0
ASA Class
I (n = 1)	1	1.1	0	0.0	1	1.1	–	–
II (n = 37)	35	38.9	2	40.0	37	38.9	0.99 [0.15 - 6.24]	0.99
III (n = 55)	52	57.8	3	60.0	55	57.9	–	–
IV (n = 2)	2	2.2	0	0.0	2	2.1	–	–
Total (n = 95)	90	100.0	5	100.0	95	100.0
Diabetes
Non-diabetic (n = 87)	84	93.3	3	60.0	87	91.6	Ref	Ref
Diabetic (n = 8)	6	6.7	2	40.0	8	8.4	9.33 [1.30 - 67.03]	0.026*
Total (n = 95)	90	100.0	5	100.0	95	100.0
Smoking Status
Non-smoker (n = 43)	40	44.9	3	60.0	43	45.7	Ref	Ref
Current Smoker (n = 2)	2	2.2	0	0.0	2	2.1	–	–
Former Smoker (n = 49)	47	52.8	2	40.0	49	52.1	0.56 [0.09 - 3.57]	0.55
Total (n = 94)	89	100.0	5	100.0	94	100.0
Estimated blood loss (cc)	1079.6	106.1	820	115.8	1065.9	100.8		0.85
Length of surgery (minutes)	389.4	12.8	500	59.6	395.3	12.7		0.09
Number of levels	10.5	0.5	8.0	1.0	10.3	0.5		0.33
Revision Status
Primary (n = 25)	23	25.6	2	40.0	25	26.3	Ref	Ref
Revision (n = 70)	67	74.4	3	60.0	70	73.7	0.51 [0.08 - 3.28]	0.48
Total (n = 95)	90	100.0	5	100.0	95	100.0
Osteotomy
No Osteotomy (n = 56)	54	60.0	2	40.0	56	58.9	Ref	Ref
Osteotomy (n = 39)	36	40.0	3	60.0	39	41.1	2.25 [0.36 - 14.14]	0.39
Total (n = 95)	90	100.0	5	100.0	95	100.0
Durotomy
No durotomy (n = 72)	69	76.7	3	60.0	72	75.8	Ref	Ref
Durotomy (n = 23)	21	23.3	2	40.0	23	24.2	2.19 [0.34 - 13.99]	0.41
Total (n = 95)	90	100.0	5	100.0	95	100.0

*p -value less than 0.05.