Table 4 Comparison of the distance from screw to quadrilateral plate between the male and female (Mean ± SD, mm, n = 100)

5.21 ± 0.90

3.20 ± 1.32

8.893

 < 0.001

8

4.27 ± 0.98

3.69 ± 0.97

2.955

0.004

5.58 ± 0.83

4.00 ± 1.19

7.615

 < 0.001

9

3.62 ± 0.96

3.08 ± 0.92

2.888

0.005

5.68 ± 0.89

4.40 ± 1.22

5.971

 < 0.001

10

3.11 ± 0.99

2.67 ± 0.70

2.505

0.014

5.51 ± 0.89

4.70 ± 1.25

3.710

 < 0.001

11

2.52 ± 0.93

2.23 ± 0.71

1.778

0.079

5.42 ± 0.93

4.84 ± 1.99

2.677

0.009

12

2.46 ± 0.87

2.00 ± 0.76

2.764

0.007

5.19 ± 0.95

4.63 ± 1.23

2.544

0.013

13

3.24 ± 0.94

2.44 ± 0.93

3.670

 < 0.001

4.88 ± 1.05

4.29 ± 1.11

2.739

0.007