Table 2 Matched pairs 2:1

Age [years], mean ± std

70.47 ± 12.08

70.01 ± 11.84

71.41 ± 12.59

0.434^a

Sex, n (%)

m

f

51 (24.6)

156 (75.4)

34 (24.6)

104 (75.4)

17 (24.6)

52 (75.4)

1^b

BMI [kg/m²],

median (max; min)

27.10 (55.9; 18.0)

27.20 (55.9; 19.2)

27.04 (43.3; 18.0)

0.879^c

AO/OTA, n (%)

44 A

44B

44 C

8 (3.9)

164 (79.2)

35 (16.9)

6 (4.3)

108 (78.3)

24 (17.4)

2 (2.9)

56 (81.2)

11 (15.9)

0.837^b

Type of ankle fracture,

n (%)

unimalleolar

bimalleolar

trimalleolar

87 (42,0)

44 (21,3)

76 (36,7)

67 (48,6)

26 (18,8)

45 (32,6)

20 (29,0)

18 (26,1)

31 (44,9)

0.027^b

Open fracture, n (%)

9 (4.3)

4 (2.9)

5 (7.2)

0.164^b

ASA-Score, mean ± std

1

2

3

4

14 (7.6)

99 (53.8)

69 (37.5)

2 (1.1)

12 (9.7)

66 (53.2)

44 (35.5)

2 (1.6)

2 (3.3)

33 (55.0)

25 (41.7)

0 (0)

0.315^b

External fixator, n (%)

34 (16.4)

18 (13.0)

16 (23.2)

0.063^b

Comorbidity, n (%)

Diabetes mellitus

Peripheral Artery Disease

Smoking

Arterial hypertension

Osteoporosis

Alcohol abuse

53 (25.6)

8 (3.9)

33 (15.9)

147 (71.0)

52 (25.1)

14 (6.8)

27 (19.6)

6 (4.3)

21 (15.2)

95 (68.8)

30 (21.7)

8 (5.8)

26 (37.7)

2 (2.9)

12 (17.4)

52 (75.4)

22 (31.9)

6 (8.7)

0.005^b

0.721^b

0.687^b

0.330^b

0.113^b

0.558^b

Time to definitive surgery [days],

median (max; min)

5 (26; 0)

5 (17; 0)

4 (26; 0)

0.004^c

Day of the week, n (%)

Mo

Tu

We

Th

Fr

Sa

Su

49 (23.7)

30 (14.5)

44 (21.3)

20 (9.7)

48 (23.2)

9 (4.3)

7 (3.4)

32 (23.2)

17 (12.3)

36 (26.1)

10 (7.2)

32 (23.2)

5 (3.6)

6 (4.3)

17 (24.6)

13 (18.8)

8 (11.6)

10 (14.5)

16 (23.2)

4 (5.8)

1 (1.4)

0.121^b

Time of surgery, n (%)

8 am − 4 pm

4 pm − 0 pm

0 am − 8 am

131 (63.3)

73 (35.3)

3 (2.2)

93 (67.4)

42 (30.4)

2 (1.4)

38 (55.1)

31 (44.9)

0 (0.0)

0.069^c

Duration of surgery [min],

median (max; min)

78.00 (218; 25)

70 (218; 25)

95 (196; 37)

< 0.001^a

Drain, n (%)

147 (71.0)

94 (68.1)

53 (76.8)

0.194^b

Syndesmotic screw,

n (%)

96 (46.4)

57 (41.3)

39 (56.5)

0.038^b

Revision surgery, n (%)

30 (14.5)

15 (10.9)

15 (21.7)

0.036^b

Time of revision surgery

Early

(< 4 postoperative weeks)

Late

(> 4 postoperative weeks)

6 (20.0)

24 (80.0)

2 (13.3)

13 (86.7)

4 (26.7)

11 (73.3)

0.651^b