Table 7 The angle α1 in the cervical intervertebral space (\(\overline{x }\)±s, °)
Level | Upper screw | Lower screw | ||
|---|---|---|---|---|
Male | Female | Male | Female | |
C3-C4 | 50.43 ± 2.37 | 52.41 ± 1.70 | 50.35 ± 1.35 | 50.73 ± 1.40 |
C4-C5 | 51.44 ± 1.78 | 51.68 ± 0.78 | 51.36 ± 1.99 | 51.27 ± 1.62 |
C5-C6 | 49.99 ± 2.68 | 51.48 ± 1.24 | 50.43 ± 3.51 | 51.05 ± 1.48 |
C6-C7 | 47.73 ± 2.11 | 49.15 ± 1.62 | 48.05 ± 1.50 | 49.42 ± 0.85 |