Table 1.

Descriptive characteristics of patients affected by unwanted tooth movements (study group) and nonaffected patients (control group)

	Study group (n = 44)		Control group (n = 43)		p-value
	n	%	n	%
Female	28	63.6	24	55.8	0.457
Male	16	36.4	19	44.2	0.457
Angle class I	22	50.0	21	48.8	0.914
Angle class II	20	45.5	17	39.5	0.577
Angle class III	2	4.5	5	11.7	0.225
Extractions	15	34.1	13	30.2	0.700

	Mean (yrs)	SD	Mean (yrs)	SD
Age at T0	12.68	2.11	14.36	5.60	0.136
Age at T1	15.44	2.20	16.97	5.61	0.327
Age at T2	17.32	2.74	19.13	5.58	0.231
Treatment duration	2.73	0.70	2.61	0.82	0.236
Retention phase	1.89	1.57	2.15	0.41	0.706

n number, yrs years, SD standard deviation