Modified surgical method of supra- and infratentorial epidural hematoma and the related anatomical study of the squamous part of the occipital bone

Table 1 Statistical analysis of the angle of the squamous part of the occipital bone and the operative angle for the supra- and infratentorial epidural hematoma between male and female

	Male (n = 16), mean ± SD (min, max)	Female (n = 16), mean ± SD (min, max)	t	P value
ASOB	118.4 ± 4.7 (108.3, 126.9)	130.4 ± 5.1 (123.2, 139.1)	6.946	< 0.001a
OAS	15.1 ± 1.8 (12.6, 18.5)	12.8 ± 2.0 (8.6, 16.4)	3.301	0.003a

^aP < 0.05. ASOB: Angle of the squamous part of the occipital bone; OAS: Operative angle for the SIEDH.