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Table 1 Comparison of variables in Group TB and Group PF in 107 patients before PSM and in 58 patients after PSM

From: More metalwork removals in patients with olecranon fracture treated by tension band wiring than plate fixation-a propensity score matching analysis

 

Group (before PSM)

χ2/Z

P

Group (after PSM)

χ2 /Z

P

TBW

PF

TBW

PF

Sex

Male

24 (22.43)

34 (31.78)

0.62

0.43

14 (24.14)

18 (31.03)

1.12

0.21

Female

24 (22.43)

25 (23.36)

15 (25.86)

11 (18.97)

Age

35 (22,59.8)

35 (22,59.8)

−1.24

0.22

33 (22,51)

38 (30,55.5)

−1.39

0.17

Occupation

Heavy worker

13 (12.15)

16 (14.95)

0

0.99

20 (34.48)

20 (34.48)

0

> 0.05

No heavy worker

35 (32.71)

43 (40.19)

9 (15.52)

9 (15.52)

Associated injury

None

22 (20.56)

33 (30.84)

5

0.29

16 (27.59)

13 (22.41)

3.27

0.55

Ipsilateral shoulder joint injury

5 (4.67)

9 (8.41)

3 (5.17)

5 (8.62)

Ipsilateral wrist joint injury

7 (6.54)

2 (1.87)

5 (8.62)

2 (3.45)

Minor head injury

8 (7.48)

9 (8.41)

3 (5.17)

6 (10.34)

Others

6 (5.61)

6 (5.61)

2 (3.45)

3 (5.17)

Mechanism of injury

Fall from standing height

19 (17.76)

22 (20.56)

2.06

0.73

14 (24.14)

10 (17.24)

2.08

0.75

Fall from height

6 (5.61)

12 (11.21)

3 (5.17)

5 (8.62)

Motor vehicle collision

11 (10.28)

15 (14.02)

6 (10.34)

9 (15.52)

Sports

7 (6.54)

5 (4.67)

4 (6.9)

3 (5.17)

Fight/assault

5 (4.67)

6 (5.61)

2 (3.45)

2 (3.45)

Diabetes

No

39 (36.45)

56 (52.34)

4.96

0.03

27 (46.55)

29 (50)

2.07

0.49

Yes

9 (8.41)

3 (2.80)

2 (3.45)

0 (0)

Dominant hand

Left hand

0 (0)

6 (5.61)

5.17

0.03

0 (0)

0 (0)

Right hand

48 (44.86)

53 (49.53)

29 (50)

29 (50)

Side of injury

Left hand

24 (22.43)

41 (38.32)

4.22

0.048

19 (32.76)

17 (29.31)

0.29

0.79

Right hand

24 (22.43)

18 (16.82)

10 (17.24)

12 (20.69)

ASA grade

I

34 (31.78)

41 (38.32)

−0.14

0.89

1 (1,1.5)

1 (1,1)

−0.23

0.97

II

10 (9.35)

13 (12.15)

III

4 (3.74)

5 (4.67)

Alcohol consumption

< 21 units/wk

42 (39.25)

55 (51.40)

1.02

0.34

28 (48.28)

26 (44.83)

1.07

0.61

> 21 units/wk

6 (5.61)

4 (3.74)

1 (1.72)

3 (5.17)

Smoking

No

34 (31.78)

41 (38.32)

0.023

1.00

22 (37.93))

20 (34.48))

0.35

0.78

Yes

14 (13.08)

18 (16.82)

7 (12.07))

9 (15.52)

Fracture

May 2A

29 (27.10)

28 (26.17)

1.79

0.24

22 (37.93)

20 (34.48)

0.07

> 0.05

May 2B

19 (17.76)

31 (28.97)

7 (12.07)

9 (15.52)

BMI

23.32 ± 3.29

22.47 ± 3.31

0.04

0.19

17 (29.31)

22.9 (19.14,25.15)

−0.156

0.88

Follow period (month)

33 (14,65)

41 (16,55)

−0.15

0.89

39 (15,65)

42 (22,53)

− 0.288

0.78