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Table 1: Optic nerve diameter at each of the retrobulbar and midaspect locations on axial and coronal MRI sections
Sex Laterality
Male Female P Value Right Left P Value
No. Mean (mm) No. Mean (mm) No. Mean (mm) No. Mean (mm)
Axial 
    Retrobulbar 203 2.22 ± 0.44 158 2.20 ± 0.41 .663 180 2.21 ± 0.43 181 2.22 ± 0.43 .925
    Midaspect 176 1.53 ± 0.40 149 1.59 ± 0.43 .223 160 1.56 ± 0.43 165 1.56 ± 0.40 .923
Coronal 
    Retrobulbar 182 2.28 ± 0.58 154 2.22 ± 0.40 .270 168 2.25 ± 0.50 168 2.26 ± 0.51 .820
    Midaspect 184 1.73 ± 0.44 149 1.76 ± 0.42 .473 164 1.75 ± 0.42 169 1.74 ± 0.45 .892

	Sex					Laterality
	Male		Female		P Value	Right		Left		P Value
	No.	Mean (mm)	No.	Mean (mm)	P Value	No.	Mean (mm)	No.	Mean (mm)	P Value
Axial
Retrobulbar	203	2.22 ± 0.44	158	2.20 ± 0.41	.663	180	2.21 ± 0.43	181	2.22 ± 0.43	.925
Midaspect	176	1.53 ± 0.40	149	1.59 ± 0.43	.223	160	1.56 ± 0.43	165	1.56 ± 0.40	.923
Coronal
Retrobulbar	182	2.28 ± 0.58	154	2.22 ± 0.40	.270	168	2.25 ± 0.50	168	2.26 ± 0.51	.820
Midaspect	184	1.73 ± 0.44	149	1.76 ± 0.42	.473	164	1.75 ± 0.42	169	1.74 ± 0.45	.892