Table 2.

Results for lateral displacement of ANS and PNS and width of opening in pterygoid processes

		Before expansion		After expansion		Treatment change		P value
		Mean	sd	Mean	sd	Mean	sd
1	Rt ANS to maxillary sagittal plane	0.00	0.00	2.59	1.70	2.59	1.70	< .0001	**
2	Lt ANS to maxillary sagittal plane	0.00	0.00	2.16	1.27	2.16	1.27	< .0001	**
3	Rt PNS to maxillary sagittal plane	0.00	0.00	2.34	1.32	2.34	1.32	< .0001	**
4	Lt PNS to maxillary sagittal plane	0.00	0.00	1.99	0.90	1.99	0.90	< .0001	**
5	Lateral displacement of Rt ANS + Lt ANS	0.00	0.00	4.75	2.59	4.75	2.59	< .0001	**
6	Lateral displacement of Rt PNS + Lt PNS	0.00	0.00	4.33	1.74	4.33	1.74	< .0001	**
7	Width of opening in Rt pterygoid process	0.00	0.00	1.35	1.79	1.35	1.79	0.011	*
8	Width of opening in Lt pterygoid process	0.00	0.00	2.17	2.45	2.17	2.45	0.004	**

All measures are expressed in mm

Rt ANS right half of anterior nasal spine, Lt ANS left half of anterior nasal spine, Rt PNS right half of posterior nasal spine, Lt PNS left half of posterior nasal spine, Rt right, Lt left

*P < .05; **P < .01