Table 1.

Comparison of BMI in different periods

	Non-extraction	Extraction	P-value
T0	20.7 ± 1.55	20.1 ± 1.40	0.16
T1	20.7 ± 1.49	20.1 ± 1.26	0.16
T2	20.6 ± 1.50	20.3 ± 1.34	0.38
T3	20.7 ± 1.43	20.4 ± 1.32	0.32
T4	20.8 ± 1.56	20.4 ± 1.27	0.35

T₀, before bracket bonding; T₁, 3 months after treatment initiation; T₂, 6 months after treatment initiation, T₃, 12 months after treatment initiation; T₄, at the end of treatment