Table 2:

Relative Total Costs Difference of SSI compared with no SSI (US Dollars)

	Total Cost (SD)	Unadjusted Cost Difference (95% CI)	Risk-adjusted Cost Difference
Any SSI	$52,620 (SD=47,730)	$21,040 (18,785–23,295)	$11,876
BY DEPTH OF SSI:
Superficial SSI	$45,306 (SD=42,231)	$13,726 (11,408–16,043)	$7,003
Deep SSI	$73,533 (SD=55,751)	$41,952 (36,807–47,098)	$25,721
BY SURGICAL CATEGORY:
Neurosurgery	$48,429 (SD=51,720)	$17,896 (4,615–31,178)	$23,755
Orthopedic	$48,123 (SD=37,259)	$19,499 (14,365–24,632)	$15,243
General Surgery	$56,052 (SD= 48,502)	$20,649 (17,381–23,917)	$10,849
Peripheral Vascular	$46,976 (SD= 47,007)	$15,380 (10,405–20,356)	$7,354
Urology	$42,575 (SD= 40,583)	$22,198 (13,315–31,081)	$4,842