Positional symmetry of porion and external auditory meatus in facial asymmetry

Maxillofacial Plastic and Reconstructive Surgery

Table 4 The downward-canted (right) and upward-canted (left) distance discrepancies of Orb-Mx, Po-Mx, and EAM-Mx

Discrepancies		Group I	Group II-A	Group II-B	p value
Vertical	Orb-Mx	0.70 ± 0.45	0.60 ± 0.36	3.72 ± 1.47	<0.001
	Po-Mx	0.46 ± 1.89	1.19 ± 2.56	3.85 ± 2.53	<0.001
	EAM-Mx	0.45 ± 1.90	1.20 ± 1.70	2.93 ± 2.35	<0.001
p value	Orb-Mx vs. Po-Mx	0.530	0.472	0.718
	Orb-Mx vs. EAM-Mx	0.538	0.284	0.026*
	Po-Mx vs. EAM-Mx	0.985	0.981	0.001*
Horizontal	Fro-Mx	0.33 ± 1.68	−1.93 ± 4.02	−0.08 ± 3.01	0.086
	Po-Mx	0.37 ± 2.51	−1.82 ± 4.26	−0.71 ± 3.24	0.166
	EAM-Mx	0.46 ± 2.66	−2.09 ± 4.22	−0.03 ± 2.67	0.057
p value	Fro-Mx vs. Po-Mx	0.938	0.872	0.290
	Fro-Mx vs. EAM-Mx	0.837	0.785	0.909
	Po-Mx vs. EAM-Mx	0.876	0.633	0.110

Mean ± standard deviation, mm, One way ANOVA and paired t-test
Mx maxillary 1st molar tip, Po porion, EAM external auditory meatus, Orb orbital plane, Fro frontal plane, * denotes statistical difference (p < 0.05)