TABLE 1.

Comparison of Surgical Site Infections (SSIs) by Pre-2013 and 2013 Definitions for Procedures Undergoing 30-Day Surveillance and 90-Day Surveillance

Procedure	Total surgeries	SSIs by old definition	SSIs by new definition	SSIs excluded, no. (%)	Old SSI ratea	New SSI ratea	SSI rate changea (new − old)
SSI data for 30- and 90-day surveillance procedures combined
Total	235,571	2,420	2,187	233 (9.6)	1.03	0.93	−0.10
Procedures designated for 30-day surveillance for SSIs
Total	123,734	1,250	1,179	71 (5.9)	1.01	0.95	−0.06
Abdominal aortic aneurysm	451	4	3	1 (25.0)	0.89	0.67	−0.22
Abdominal hysterectomy	10,713	123	117	6 (4.9)	1.15	1.09	−0.06
Abdominal proceduresb	3,366	181	166	15 (8.3)	5.38	4.93	−0.45
Abdominal transplantsc	476	27	27	0 (0)	5.67	5.67	0
Appendix surgery	9,119	74	73	1 (1.4)	0.81	0.80	−0.01
Carotid endarterectomy	2,522	10	9	1 (10.0)	0.40	0.36	−0.04
Cesarean section	16,488	141	141	0 (0)	0.86	0.86	0
Colon surgery	7,739	248	234	14 (5.7)	3.20	3.02	−0.18
Exploratory laparotomy	5,011	84	78	6 (7.1)	1.68	1.56	−0.12
Gallbladder surgery	27,715	81	81	0 (0)	0.29	0.29	0
Gastric surgery	7,015	59	56	3 (5.1)	0.84	0.80	−0.04
Kidney surgery	1,206	10	10	0 (0)	0.83	0.83	0
Laminectomy	9,374	97	84	13 (13.4)	1.03	0.90	−0.13
Limb amputation	4,973	46	44	2 (4.4)	0.92	0.88	−0.04
Other (other prosthesis)	2,214	15	6	9 (60.0)	0.68	0.27	−0.41
Prostate surgery	1,780	1	1	0 (0)	0.06	0.06	0
Thoracic surgery	2,624	11	11	0 (0)	0.42	0.42	0
Thyroid and/or parathyroid surgery	4,513	4	4	0 (0)	0.09	0.09	0
Vaginal hysterectomy	6,435	34	34	0 (0)	0.53	0.53	0
Procedures designated for 90-day surveillance for SSIs
Total	111,837	1,170	1,008	162 (13.9)	1.05	0.90	−0.15
Breast	17,468	142	127	15 (10.6)	0.81	0.73	−0.08
Cardiac surgery	1,062	11	7	4 (36.4)	1.04	0.66	−0.38
Coronary artery bypass grafting	5,065	68	60	8 (11.8)	1.34	1.18	−0.16
Craniotomy	1,487	17	17	0 (0)	1.14	1.14	0
Herniorrhaphy	21,947	169	153	16 (9.5)	0.77	0.70	−0.07
Hip prosthesis	12,200	181	165	16 (8.8)	1.48	1.35	−0.13
Knee prosthesis	20,767	203	152	51 (25.1)	0.98	0.73	−0.25
Open reduction internal fixation	14,361	149	117	32 (21.5)	1.04	0.81	−0.23
Pacemaker	1,679	1	1	0 (0)	0.06	0.06	0
Peripheral vascular bypass	1,811	69	62	7 (10.1)	3.81	3.42	−0.39
Spinal fusion	13,721	158	147	11 (7.0)	1.15	1.07	−0.08
Ventricular shunt	269	2	0	2 (100)	0.74	0	−0.74

^aCases per 100 procedures.

^bBile duct, liver, pancreatic, spleen, small bowel.

^cKidney, liver.