Table 3.

Comparison the diameters of FV and the distance between FV and FO according to sides and sexes.

Measurements (mm)	Total sides		Right side		Left side		Male		Female
	N	Mean ± SD	N	Mean ± SD	N	Mean ± SD	N	Mean ± SD	N	Mean ± SD
FV in the middle cranial fossa
Maximum diameter	40	2.00 ± 0.91a	17	1.71 ± 0.58	23	2.22 ± 1.05	29	2.10 ± 1.01	11	1.75 ± 0.54
Minimum diameter	40	0.96 ± 0.48	17	0.92 ± 0.47	23	0.98 ± 0.50	29	0.97 ± 0.53	11	0.91 ± 0.33
Average diameter	40	1.48 ± 0.65	17	1.31 ± 0.46	23	1.60 ± 0.74	29	1.53 ± 0.73	11	1.36 ± 0.33
FV-FO distance	39	2.78 ± 1.46b	16	3.15 ± 1.64	23	2.53 ± 1.30	29	2.67 ± 1.52	10	3.11 ± 1.27
FV at the extracranial view of the skull base
Maximum diameter	200	2.45 ± 1.01a	90	2.29 ± 0.97c	110	2.58 ± 1.03c	136	2.45 ± 1.05	64	2.44 ± 0.93
Minimum diameter	200	0.96 ± 0.46	90	0.99 ± 0.44	110	0.93 ± 0.48	136	0.97 ± 0.48	64	0.93 ± 0.41
Average diameter	200	1.70 ± 0.63	90	1.64 ± 0.61	110	1.75 ± 0.64	136	1.71 ± 0.65	64	1.68 ± 0.57
FV-FO distance	201	2.05 ± 1.09b	90	2.05 ± 1.17	111	2.05 ± 1.03	136	2.06 ± 1.15	65	2.02 ± 0.97

^a–cSignificant difference between groups which are indicated with the same alphabet at P  value < 0.05.