Table 3. Summary of measurements for the head-neck junction concavity.

		Normal	OA	p value
Alpha angle (°)	Male	39.61 ± 2.56	41.42 ± 2.51	<0.001
	Female	38.77 ± 2.27	40.46 ± 1.52	<0.001
p value		0.020	0.008
Beta angle (°)	Male	39.51 ± 2.55	40.38 ± 1.90	0.016
	Female	39.01 ± 1.88	40.13 ± 1.84	<0.001
p value		0.125	0.455
Gamma angle (°)	Male	47.82 ± 2.19	48.96 ± 2.28	0.001
	Female	47.05 ± 2.94	48.09 ± 2.69	0.032
p value		0.047	0.046
Delta angle (°)	Male	38.91 ± 1.93	40.15 ± 2.25	<0.001
	Female	38.29 ± 2.13	39.30 ± 2.22	0.006
p value		0.040	0.031