Table 1.

Sample size analysis for 80% power, with 0.05 alpha value

Parameter	Number	Treatment change		n for 80% power
		Mean	sd
Rt ANS to maxillary sagittal plane	15	2.59	1.70	6
Lt ANS to maxillary sagittal plane	15	2.16	1.27	5
Rt PNS to maxillary sagittal plane	15	2.34	1.32	5
Lt PNS to maxillary sagittal plane	15	1.99	0.90	4
Width of opening in Rt pterygoid process	15	1.35	1.79	15
Width of opening in Lt pterygoid process	15	2.17	2.45	13