Table 1.

Body weight changes (kg) between groups during expansion and retention periods.

Groups	T1-T0		T2-T0		Significance
	Mean	SD	Mean	SD	T1-T0	T2-T0
ED 71	0.383	0.106	0.421	0.124	NS	NS
Control	0.286	0.194	0.400	0.135	NS	NS