Table 1.

Means and standard deviations (SD) for the rate of en masse retraction for both groups

Mittelwerte und Standardabweichungen (SD) für die Rate der En-masse-Retraktion für beide Gruppen

	LG (N = 16)		NLG (N = 16)			t‑test			95% CI
	Mean (mm)	±SD	Mean (mm)	±SD	Difference (mm)	t‑value	P-value	Effect size	Upper	Lower
1st month	0.704	0.513	0.473	0.332	0.231	0.776	0.463	0.521	1.236	−0.176
2nd month	0.922	0.606	0.337	0.351	0.585	1.701	0.131	1.152	1.927	0.419
3rd month	1.275	0.575	0.363	0.222	0.912	2.961	0.025*	2.040	2.952	1.210
4th month	1.072	0.858	0.935	0.44	0.137	0.288	0.782	0.196	0.894	−0.496
5th month	0.977	0.766	0.567	0.441	0.41	0.82	0.45	0.639	1.363	−0.062
6th month	0.475	0.0173	0.667	0.607	−0.192	−0.654	0.542	−0.436	0.259	−1.146
7th month	1.353	0.761	1.04	1.359	0.313	0.393	0.711	0.277	0.978	−0.415
8th month	1.017	1.506	0.68	0.269	0.337	0.298	0.785	0.304	1.006	−0.388
9th month	0.303	0.418	0.505	0.403	0.202	1.392	0.174	−0.480	0.216	−1.192
10th month	0.231	0.192	0.23	0.325	−0.001	−0.011	0.991	0.004	0.697	−0.689
11th month	N/A	N/A	0.47	0.438	N/A	N/A	N/A
12th month	N/A	N/A	0.05	0.0707	N/A	N/A	N/A
Rate of retraction	0.833	0.371	0.526	0.268	−0.307	−2.251	0.035*	0.002	0.695	−0.691
TRDu	10.125	2.876	13.643	3.455	3.518	3.13	0.004*	−1.079	−0.352	−1.846

LG laser group, NLG nonlaser group, TRDu total retraction duration, 95% CI 95% confidence interval, N/A not applicable

*Significant when P ≤ 0.05