Thickness change of masseter muscles and the surrounding soft tissues in female patients during orthodontic treatment: a retrospective study

Table 4 Results of the multiple linear regression analysis

	Included variables	Standardized coefficient (β)	Adjusted R²	P value
MAS	Extraction	0.435	0.325	< 0.01
	FMA	−0.438	0.325	< 0.01
	STpre	0.416		< 0.01
MM	FMA	−0.353	0.123	0.031
MM	Extraction	0.325		0.034
FT	Extraction	0.325	0.229	< 0.01
FT	Pretreatment age	0.301		0.049

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