Operations n (%)

Infections n (rate per 100 procedures)

Duration of operation

Under the 75th percentile

48,438 (80%)

1108 (2.3%)

Over the 75th percentile

12,022 (20%)

520 (4.3%)

ASA score

1

18,085 (30%)

285 (1.6%)

2

26,019 (43%)

712 (2.7%)

3

9410 (16%)

422 (4.5%)

4

1804 (3%)

116 (6.4%)

5

152 (0%)

9 (5.9%)

Unknown

4990 (8%)

84 (1.7%)

Wound class

I―clean

29,055 (49%)

478 (1.6%)

II―clean/contaminated

23,844 (40%)

673 (2.8%)

III―contaminated

4947 (8%)

318 (6.4%)

IV―dirty

1488 (3%)

152 (10.2%)

Technique of operation

Classic

46,911 (79%)

1414 (3%)

Videoscopic

12,125 (21%)

211 (1.7%)

Hospital stay before operation

<2 day

28,499 (47%)

485 (1.7%)

³2 day

31,917 (53%)

1141 (3.6%)

Sex

Male

20,298 (34%)

668 (1.7%)

Female

40,162 (66%)

960 (2.4%)

Age

0 - 1

399 (1%)

7 (1.8%)

2 - 5

470 (1%)

6 (1.3%)

6 - 15

955 (2%)

23 (2.4%)

16 - 45

21,778 (36%)

376 (1.7%)

46 - 65

16,262 (27%)

461 (2.8%)

66 - 85

18,533 (31%)

690 (3.7%)

³85

1955 (3%)

65 (3.3%)

Urgent operation

No

45,044 (75%)

1174 (2.6%)

Yes

15,006 (25%)

452 (3%)

Operative procedure category

Caesarean section

12,970 (21%)

222 (1.7%)

Cholecystectomy

9653 (16%)

162 (1.7%)

Breast surgery

8724 (14%)

156 (1.8%)

Colon surgery

6130 (10%)

508 (8.3%)

Herniorrhaphy

4172 (7%)

50 (1.2%)

Open reduction of fracture

2365 (4%)

14 (0.6%)

Appendectomy

1957 (3%)

51 (2.6%)

Prostatectomy

1558 (3%)

49 (3.1%)

Rectal surgery

1412 (2%)

126 (8.9%)

Laminectomy

1407 (2%)

5 (0.4%)

Thoracic surgery

1010 (2%)

11 (1.1%)