Table 5.

Mean and standard deviation of ridge width (4 mm) at different follow-up periods

Ridge width (4 mm)	OD group		Expanders group		Difference	95% CI	P value
	Mean	SD	Mean	SD
Preoperative	7.40b	0.95	6.89b	1.01	−0.51	−1.38 to 0.35	0.2346
Baseline	8.83a	1.12	7.56a	0.76	−1.27	−2.12 to −0.41	0.0055*
3 months	8.72a	1.15	6.73b	0.64	−1.99	−2.86 to −1.10	0.0002*
6 months	8.41a	1.00	6.65b	0.68	−1.76	−2.59 to −0.92	0.0004*
	<0.001*		0.005*

Means that do not share a letter vertically are significantly different