Predictability of crowding resolution in clear aligner treatment

Progress in Orthodontics

Table 3 Comparison between T0, T1v, and T1 in lower arch

Variables	T0		v T1		T1		Shapiro–Wilk	Predictability (%)	p
Variables	Mean	SD	Mean	SD	Mean	SD	Shapiro–Wilk	Predictability (%)	p
Irregularity index	8.13	4.10	1.40	0.30	2.66	1.57	0.89	81.0	0.03*
3-3 width	18.48	1.82	19.92	1.79	19.15	1.42	0.94	49.0	0.03*
4-4 width	25.21	2.35	26.38	1.96	26.03	1.83	0.91	67.0	0.02*
5-5 width	29.60	2.74	31.10	2.42	31.10	2.42	0.93	68.0	0.09*
6-6 width	32.51	3.11	33.97	2.93	33.37	2.96	0.87	67.0	0.02*
Arch length	24.35	3.10	23.99	3.06	24.00	2.99	0.83	69.0	0.02*
IPR	–	–	1.43	1.10	0.82	0.84	0.89	42.02	0.03*