Table 7: Distribution of cases with anterior tooth size discrepancies outside 2 SD from Bolton mean values (anterior ratio X -= 77.2 ± 2 SD: 73.9 and 80.5, respectively).

-	Anterior Ratio
Classification	Outside SD (%)	SD 2 (%)	SD 1 (%)	Mean (%)	SD 1 (%)	SD 2 (%)	Outside SD (%)
-	< 73.9	73.9-75.4	75.5-77.1	77.2	77.3-78.8	78.9-80.5	>80.5
Class I	-	-	-	-	250 (94)	16 (6)	-
Class II	-	-	-	-	37 (35.6)	62 (59.6)	5 (4.8)
Class III	-	-	8 (29.6)	-	19 (70.4)	-	-
Normal	-	-	3 (3.7)	1 (1.2)	76 (94)	1 (1.2)	-