Table 1.

Descriptive statistics and comparisons between groups at T1

		Control group			RPE group
		n = 15 (7 M; 8 F)			n = 33 (15 M; 18 F)
Variable	Unit	N	Mean	sd	N	Mean	sd
Age	years	15	8.3	1.2	33	8.8	1.1
T1-T2	months	15	12	2.4	33	15	2.4
36–46 (occlusal)	mm	15	46.9	2.4	33	47.1	2.9
36–46 (lingual)	mm	15	33.7	1.7	33	33.5	2.4
33–43	mm	14	27.0	1.5	16	26.5	2.0
36 angulation	°	15	−44.7	6.8	33	−47.6	8.8
46 angulation	°	15	−44.7	10.7	33	−48.4	6.9
33 angulation	°	13	−13.7	6.8	20	−15.8	6.8
43 angulation	°	13	−16.3	8.9	20	−17.1	12.0
31 angulation	°	15	−8.1	4.8	25	−9.0	6.2
41 angulation	°	15	−7.7	5.4	25	−8.7	7.6

All comparisons were not significant (p > 0.05, Student’s t test for independent samples)