Table 1. Comparison of age distribution and pretreatment Little' irregularity index (LII) between the Damon3 MX and conventional MBT bracket groups .

Bracket type	Mean age (SD)	Mean pretreatment upper LII score (SD)	Mean pretreatment lower LII score (SD)
MBT (n=15)	16.13 (1.25)	5.63 (1.45)	5.54 (2.41)
Damon3 MX (n=15)	16.26 (1.39)	6.90 (1.66)	4.67 (2.06)
Comparison between groups	T= -0.27 P=0.78	T= -2.23 P=0.03*	T=1.06 P=0.68

*P<0.05.