Table 2 Baseline characteristics of the ITT set

 Male

9 (37.5%)

10 (40.0%)

19 (38.8%)

 Female

15 (62.5%)

15 (60.0%)

30 (61.2%)

p value (χ²)

0.8575

N

24

25

49

 Mean

57.38

53.64

55.47

 STD

9.37

16.85

13.70

 Mean difference

3.74

p value (t test)

0.3413

 Left

7 (29.2%)

11 (44.0%)

18 (36.7%)

 Right

17 (70.8%)

14 (56.0%)

31 (63.3%)

p value (χ²)

0.2816

 Flex 20

4 (16.7%)

3 (12.0%)

7 (14.3%)

 Flex 24

4 (16.7%)

6 (24.0%)

10 (20.4%)

 Flex 28

16 (66.7%)

16 (64.0%)

32 (65.3%)

p value (χ²)

0.7700

 Surgeon 1

2 (8.3%)

1 (4.0%)

3 (6.1%)

 Surgeon 2

13 (54.2%)

16 (64.0%)

29 (59.2%)

 Surgeon 3

2 (8.3%)

0 (0.0%)

2 (4.1%)

 Surgeon 4

2 (8.3%)

3 (12.0%)

5 (10.2%)

 Surgeon 7

1 (4.2%)

2 (8.0%)

3 (6.1%)

 Surgeon 9

1 (4.2%)

0 (0.0%)

1 (2.0%)

 Surgeon 10

1 (4.2%)

3 (12.0%)

4 (8.2%)

 Surgeon 11

1 (4.2%)

0 (0.0%)

1 (2.0%)

 Surgeon 12

1 (4.2%)

0 (0.0%)

1 (2.0%)

p value (χ²)

0.5195

 Surgeon 2

13 (54.2%)

16 (64.0%)

29 (59.2%)

 Other surgeons

11 (45.8%)

9 (36.0%)

20 (40.8%)

p value (χ²)

0.4839