Three-dimensional analysis of the relationship between mandibular retromolar space and positional traits of third molars in non-hyperdivergent adults

Table 2 Basic information of the third molars

Classification criterion	Groups	Number	Corresponding age^a	Corresponding gender
Classification criterion	Groups	Number	Corresponding age^a	male	female
Depth
	PG-A	85	29.08 ± 0.61	44	41
	PG-B	60	27.00 ± 0.76	29	32
	PG-C	61	28.82 ± 0.74	30	31
	P Value		0.082
Ramus Relationship
	PG-I	78	30.17 ± 0.65	41	37
	PG-II	75	28.41 ± 0.66	40	35
	PG-III	53	25.77 ± 0.70	21	32
	P Value		0.000***
Mesiodistal angle
	A1	68	28.65 ± 0.67	31	37
	A2	69	27.80 ± 0.76	37	32
	A3	69	28.75 ± 0.68	34	35
	P Value		0.573
Labiolingual angle
	B1	71	29.79 ± 0.59	37	34
	B2	70	27.96 ± 0.69	36	34
	B3	65	27.35 ± 0.80	29	36
	P Value		0.056
Total	n = 206	206	28.40 ± 0.40	102	104

^aOne-way ANOVA of corresponding age in each three groups under different classification criteria
^***Significant difference at P < 0.05

ISSN: 1472-6831