Table 2 Description of the surgical site infections according to the site and the period

Age (in years), median (Q1-Q3)

66 (56.5 – 74)

65 (49.5 – 72.5)

59.5 (45.5 – 70.5)

66 (51 – 75)

0.240

68.5 (60.25 – 74)

72 (64 – 78)

66 (59 (71.5)

0.057

Male gender, n(%)

61 (60.0)

33 (60.0)

12 (50.0)

21 (70.0)

0.134

28 (60.9)

11 (61.1)

17 (60.7)

0.979

BMI (in kg/m2), median (Q1-Q3)

28.9 (25.3 – 33.6)

28.8 (24.9 – 32.9)

30.2 (25.4 – 35.4)

28.1 (24.8 – 32.1)

0.134

29.6 (26.4 – 34.8)

28.4 (26.4 – 31.1)

31.3 (26.7 – 35.7)

0.405

CCI, median (Q1-Q3)

1 (0 – 2)

0 (0 – 2)

0.5 (0 – 2.5)

0 (0 – 2)

0.300

1 (0 – 2)

1 (0 – 2)

1 (0 – 2.5)

0.615

ASA score, n (%)

1

18 (18.0)

11 (20.4)

6 (25.0)

5 (16.7)

0.668

7 (15.2)

1 (5.6)

6 (21.4)

0.078

2

41 (41.0)

21 (38.9)

8 (33.3)

13 (43.3)

20 (43.5)

6 (33.3)

14 (50.0)

3

40 (40.0)

22 (40.7)

10 (41.7)

12 (40.0)

18 (39.1)

11 (61.1)

7 (25.0)

4

1 (1.0)

0

0

0

1 (2.2)

0

1 (3.6)

Altemeier classification, n (%)

1

99 (99.0)

53 (98.2)

23 (95.83)

30 (100)

0.444

46 (100)

18 (100)

28 (100)

-

2

1 (1.0)

1 (1.8)

1 (4.2)

0

0

0

0

Time between admission and the surgery (in hours), median (Q1-Q3)

18 (17 – 20)

19 (17 – 21)

19 (17 – 21.5)

19 (17 – 22)

0.680

17 (17 – 19)

17 (17 – 19)

17 (17 – 18.5)

0.881

Duration of the surgery (in minutes), median (Q1-Q3)

85 (65 – 125)

113 (75 – 152.75)

127 (88 – 153.5)

87 (68 – 144)

0.183

72 (59.3 – 100.3)

75 (65 – 106)

71 (58 – 81)

0.350

Type of surgery n (%)

OS of the UEF

0

0

0

0

0.038

0

0

0

0.074

Other OS

17 (17.0)

14 (25.9)

9 (37.5)

5 (16.7)

3 (6.5)

2 (11.1)

1 (3.6)

Knee prostheses

37 (37.0)

12 (22.2)

8 (33.3)

4 (13.3)

25 (54.3)

11 (61.1)

14 (50.0)

Hip prostheses

28 (28.0)

15 (27.8)

5 (20.8)

10 (33.3)

13 (28.3)

2 (11.1)

11 (39.3)

Revision of knee prosthesis

4 (4.0)

2 (3.7)

0

2 (6.7)

2 (4.4)

2 (11.1)

0

Revision of hip prosthesis

14 (14.0)

11 (20.4)

2 (8.3)

9 (30.0)

3 (6.5)

1 (5.6)

2 (7.1)

Smoking, n (%)

n= 98

0.079

n= 44

n= 26

0.682

19 (19.4)

12 (22.2)

8 (33.3)

4 (13.3)

7 (15.9)

2 (11.1)

5 (19.2)

Alcoholism, n (%)

n = 99

1.000

n= 45

n= 27

1.000

4 (4.0)

1 (1.9)

0

1 (3.3)

3 (6.7)

1 (5.6)

2 (7.4)

IV drug abuse, n (%)

0

Presence of HBP, n (%)

58 (58.0)

26 (48.2)

10 (41.7)

16 (53.3)

0.394

32 (69.6)

14 (77.8)

18 (64.3)

0.332

Presence of diabetes, n (%)

26 (26.0)

12 (22.2)

8 (33.3)

4 (13.3)

0.079

14 (30.4)

8 (44.4)

6 (21.4)

0.098

Presence of immunosuppression, n (%)

4 (4.0)

1 (1.8)

0

1 (3.3)

1.000

3 (6.5)

2 (11.1)

1 (3.6)

0.552

Presence of negligence, n (%)

3 (3.0)

1 (1.8)

0

1 (3.3)

1.000

2 (4.3)

0

2 (7.1)

0.513

Preoperative shower taken on D0, n (%)

n= 97

62 (63.9)

n= 53

39 (73.6)

16 (66.7)

n= 29

23 (79.3)

0.299

n= 44

23 (52.3)

2 (11.1)

n= 26

21 (80.8)

<0.001

Preoperative antibiotic prophylaxis: suitable molecule, n (%)

n= 96

n= 53

n= 23

0.434

n= 43

n= 16

n= 27

95 (99.0)

52 (98.1)

22 (95.7)

30 (100)

43 (100)

16 (100)

27 (100)

Operating theatre, n (%)

0.947

n= 44

n= 17

0.697

1 North

38 (70.4)

17 (70.8)

21 (70.0)

0

0

0

2 North

16 (29.6)

7 (29.2)

9 (30.0)

0

0

0

1 South

0

0

0

11 (25.0)

5 (31.3)

6 (21.4)

2 South

0

0

0

17 (38.6)

5 (31.3)

12 (42.9)

3 South

0

0

0

10 (22.7)

3 (18.8)

7 (25.0)

4 South

0

0

0

6 (13.6)

3 (18.8)

3 (10.7)

Position in the daily surgical schedule, n (%)

n= 98

0.234

n= 44

n= 16

0.780

1

36 (36.7)

26 (48.1)

9 (37.5)

17 (56.7)

10 (22.7)

4 (25.0)

6 (21.4)

2

39 (39.8)

18 (33.3)

9 (37.5)

9 (30.0)

21 (47.7)

9 (56.3)

12 (42.9)

3

13 (13.3)

4 (7.4)

3 (12.5)

1 (3.3)

9 (20.5)

3 (18.8)

6 (21.4)

4

6 (6.1)

4 (7.4)

3 (12.5)

1 (3.3)

2 (4.5)

0

2 (7.1)

5

4 (4.1)

2 (3.7)

0

2 (6.7)

2 (4.5)

0

2 (7.1)

Number of people present in the operating theatre, n (%)

n = 99

0.532

n= 45

n= 17

0.477

4

1 (1.0)

0

0

0

1 (2.2)

0

1 (3.4)

5

4 (4.0)

3 (5.6)

3 (12.5)

0

1 (2.2)

1 (5.9)

0

6

10 (10.1)

6 (11.1)

2 (8.3)

4 (13.3)

4 (8.9)

3 (17.7)

1 (3.6)

7

22 (22.2)

14 (25.9)

8 (33.3)

6 (20.0)

8 (17.8)

4 (23.5)

4 (14.3)

8

29 (29.3)

13 (24.1)

6 (25.0)

7 (23.3)

16 (35.6)

4 (23.5)

12 (42.9)

9

13 (13.1)

6 (11.1)

2 (8.3)

4 (13.3)

7 (15.6)

3 (17.7)

4 (14.3)

10

11 (11.1)

7 (13.0)

2 (8.3)

5 (16.7)

4 (8.9)

2 (11.8)

2 (7.1)

11

5 (5.1)

3 (5.5)

1 (4.2)

2 (6.7)

2 (4.4)

0

2 (7.1)

12

1 (1.0)

1 (1.8)

0

1 (3.3)

0

0

0

13

1 (1.0)

0

0

0

1 (2.2)

0

1 (3.6)

14

1 (1.0)

0

0

0

1 (2.2)

0

1 (3.6)

15

1 (1.0)

1 (1.8)

0

1 (3.3)

0

0

0

Presence of a postoperative haematoma, n (%)

n= 86

26 (30.2)

n= 47

13 (27.7)

n= 20

8 (40.0)

n= 27

5 (18.5)

0.104

n= 39

13 (33.3)

n= 15

4 (26.7)

n= 24

9 (37.5)

0.485

Postoperative anticoagulation, n (%)

n= 93

88 (94.6)

n= 50

47 (94.0)

n= 20

20 (100)

27 (90.0)

0.265

n= 43

41 (95.4)

n= 15

15 (100)

26 (92.9)

0.535

Non-compliance with postoperative recommendations, n (%)

n= 75

3 (4.0)

n= 42

1 (2.4)

n= 12

1 (8.3)

0

0.286

n= 33

2 (6.1)

n= 5

1 (20.0)

1 (3.6)

0.284

Time between surgery and the SSI (days), median (Q1-Q3)

29.5 (20 – 104)

21.5 (14-48)

19 (11-38)

29 (14-68)

0.136

32 (18-68)

32.5 (17 – 77)

32 (22-63.5)

0.773

Monomicrobial S. aureus SSI, n (%)

Superficial

4 (4.0)

1 (1.9)

0

1 (3.3)

0.286

3 (6.5)

2 (11.1)

1 (3.6)

1.000

Deep

26 (26.0)

13 (24.1)

10 (41.7)

3 (10.0)

13 (28.3)

7 (38.9)

6 (21.4)

CCFM SSI, n (%)

Superficial

4 (4.0)

1 (1.9)

0

1 (3.3)

0.381

3 (6.5)

2 (11.1)

1 (3.6)

1.000

Deep

39 (39.0)

20 (37.0)

13 (54.2)

7 (23.3)

19 (41.3)

10 (55.5)

9 (32.1)

All SSI, n (%)

Superficial

10 (10.0)

3 (5.6)

1 (4.2)

2 (6.7)

0.585

7 (15.2)

3 (16.7)

4 (14.3)

1.000

Deep

90 (90.0)

51 (94.4)

23 (95.8)

28 (93.3)

39 (84.8)

15 (83.3)

24 (85.7)