Table 5.

Binary analysis of factors associated with EE of the maxillary FPM.

Variable	Binary analysis
	Odds ratio (95 % confidence interval)	P value
Sex	4.798 (1.922–11.979)	0.001∗∗
The length of the posterior maxillary alveolar bone (mm)	0.796 (0.703–0.900)	<0.001∗∗∗
U6-OP (mm)	1.769 (1.300–2.407)	<0.001∗∗∗
Overbite (mm)	0.791 (0.633–0.987)	0.038∗
Overjet (mm)	0.788 (0.676–0.918)	0.002∗∗
EA (°)	0.927 (0.886–0.970)	0.001∗∗

∗P < 0.05; ∗∗P < 0.01; ∗∗∗P < 0.001.