Distance Males Females All cases P-value
Mean (SD) Mean (SD) Mean (SD)
D1 3.81 (1.51) 3.68 (1.98) 3.75 (1.76) 0.736b
D2 9.36 (1.85) 9.65 (2.2) 9.51 (2.03) 0.505b
D3 6.7 (1.69) 6.82 (1.87) 6.76 (1.78) 0.745b
D4 26.52 (5.24) 24.41 (3.88) 25.44 (4.69) 0.034a

aSignificant, independent samples t-test (significance level P < 0.05).
bNot significant, independent samples t-test (significance level P < 0.05).
D1 = maximum length of the bony septum from the canal to the wall of the maxillary sinus; D2 = distance from the inferior orbital rim where the infraorbital canal begins to protrude into the maxillary sinus; D3 = maximum vertical distances from the canal to the sinus roof; D4 = maximum vertical distances from the canal to the sinus floor; SD = standard deviation.