Table 4.

Mean and standard deviation of ridge width (2 mm) at different follow-up periods

Ridge width (2 mm)	OD group		Expanders group		Difference	95% CI	P value
	Mean	SD	Mean	SD
Preoperative	6.63b	0.93	5.60b	0.96	−1.03	−1.87 to −0.18	0.0193*
Baseline	7.74a	0.91	6.76a	0.92	−0.97	−1.78 to −0.16	0.0213*
3 months	7.64a	0.85	5.78b	0.98	−1.86	−2.71 to −0.99	0.0003*
6 months	7.73a	1.18	5.47b	0.87	−2.25	−3.26 to −1.24	0.0002*
P value	<0.001*		<0.001*

Means that do not share a letter vertically are significantly different