Table 2.

Ridge Width Variation between Surgical Stages and Paired Samples t-Test for the Difference

	Mean difference	SD	95% CI for the difference	Paired samples t-test
Stage I preoperative – Stage I postoperative	3.63	1.28	[3.37, 3.88]	t(96) = 27.87, p < .01
Stage II – Stage I postoperative	−0.49	0.54	[−0.60, −0.39]	t(96) = −9.05, p < .01
Overall gain: Stage II – Stage I preoperative	3.13	1.24	[2.88, 3.39]	t(96) = 24.73, p < .01

α = 0.05.

Values expressed in millimeters.

CI = confidence interval; SD = standard deviation.