Variables | Goutallier grade | Concave side | Convex side | Z value (convex-concave) | P value |
---|---|---|---|---|---|
Upper intervertebral level | 0 | 0 | 11 | − 7.616 | < 0.001 |
1 | 5 | 6 | Â | Â | |
2 | 17 | 49 | Â | Â | |
3 | 66 | 44 | Â | Â | |
4 | 44 | 22 | Â | Â | |
Lower intervertebral level | 0 | 0 | 6 | − 2.345 | 0.019 |
1 | 6 | 5 | Â | Â | |
2 | 16 | 11 | Â | Â | |
3 | 66 | 33 | Â | Â | |
4 | 44 | 77 | Â | Â | |
Z value (lower-upper) |  | − 0.093 | − 7.049 |  |  |
P value |  | 0.926 | < 0.001 |  |  |