TABLE 1.

Thirty-day SSI rates by general procedure category (unadjusted univariate analysis).

	NSQIP-P				COA
Procedure Category	No. of Procedures (% of total)	No. of SSIs (%)	OR (95% CI)	p Value	No. of Procedures (% of total)	No. of SSIs (%)	OR (95% CI)	p Value
Spine	2879 (31)	101 (3.5)	1.519 (1.176–1.963)	0.002	283 (26)	14 (4.9)	1.888 (0.952–3.742)	0.079
Craniotomy for neoplasm	2434 (26)	60 (2.5)	0.883 (0.658–1.184)	0.424	165 (15)	5 (3.0)	0.914 (0.350–2.386)	0.855
Chiari decompression	1748 (19)	33 (1.9)	0.647 (0.447–0.937)	0.021	84 (8)	0 (0)	NA
Craniosynostosis/craniofacial	980 (11)	15 (1.5)	0.532 (0.314–0.901)	0.016	46 (4)	1 (2.2)	0.649 (0.087–4.843)	0.671
MMC closure	368 (4)	16 (4.3)	1.681 (1.002–2.821)	0.068	48 (4)	3 (6.3)	2.065 (0.610–6.987)	0.203
Epilepsy*	208 (2)	7 (3.4)	1.262 (0.588–2.711)	0.513	256 (23)	8 (3.1)	0.944 (0.425–2.097)	0.887
Skin lesion	136 (2)	1 (0.7)	0.264 (0.037–1.895)	0.276	70 (6)	1 (1.4)	0.413 (0.056–3.062)	0.723
Other†	543 (6)	18 (3.3)	1.254 (0.770–2.041)	0.340	171 (14)	4 (2.6)	0.782 (0.273–2.244)	0.808
Total	9296	251 (2.7)			1103	36 (3.3)

Odds ratios are with respect to development of any SSI compared to all other procedures not in respective category. Statistical tests were performed using the chi-square test and Fisher exact test where appropriate. Boldface type indicates statistical significance (p < 0.05).

^*Epilepsy operations data not available for 2012–2013; NSQIP only has epilepsy procedure data for 2014. See Fig. 1 for more detailed procedural categorization by CPT code.

^†Majority of procedures in “Other” category are baclofen pump placement/removal procedures (> 80% of total).