Table 3: Comparison the diameters of FV and the distance between FV and FO according to sides and sexes.

Measurements (mm)Total sidesRight sideLeft sideMaleFemale
NMean ± SDNMean ± SDNMean ± SDNMean ± SDNMean ± SD

FV in the middle cranial fossa

Maximum diameter402.00 ± 0.91a171.71 ± 0.58232.22 ± 1.05292.10 ± 1.01111.75 ± 0.54
Minimum diameter400.96 ± 0.48170.92 ± 0.47230.98 ± 0.50290.97 ± 0.53110.91 ± 0.33
Average diameter401.48 ± 0.65171.31 ± 0.46231.60 ± 0.74291.53 ± 0.73111.36 ± 0.33
FV-FO distance392.78 ± 1.46b163.15 ± 1.64232.53 ± 1.30292.67 ± 1.52103.11 ± 1.27

FV at the extracranial view of the skull base

Maximum diameter2002.45 ± 1.01a902.29 ± 0.97c1102.58 ± 1.03c1362.45 ± 1.05642.44 ± 0.93
Minimum diameter2000.96 ± 0.46900.99 ± 0.441100.93 ± 0.481360.97 ± 0.48640.93 ± 0.41
Average diameter2001.70 ± 0.63901.64 ± 0.611101.75 ± 0.641361.71 ± 0.65641.68 ± 0.57
FV-FO distance2012.05 ± 1.09b902.05 ± 1.171112.05 ± 1.031362.06 ± 1.15652.02 ± 0.97

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