Table 1.

Post hoc test of p values across different imaging sites at each time point for different QUS-based parameters.

	Site a	Site b	iBSC p value	Slope p value	Y-intercept p value
Pre-surgery	FP	NP	< 0.001***	0.011*	< 0.001***
		ND	< 0.001***	0.011*	< 0.001***
		FD	< 0.001***	< 0.001***	< 0.001***
	NP	ND	NA	NA	NA
		FD	0.001**	0.014*	< 0.001***
	ND	FD	0.001**	0.014*	< 0.001***
1 month	FP	NP	0.254	0.002**	0.001**
		ND	< 0.001***	< 0.001***	0.487
		FD	< 0.001***	0.608	< 0.001***
	NP	ND	< 0.001***	0.633	< 0.001***
		FD	< 0.001***	0.002**	< 0.001***
	ND	FD	< 0.001***	0.007**	< 0.001***
2 month	FP	NP	0.034*	0.103	0.978
		ND	0.148	< 0.001***	< 0.001***
		FD	< 0.001***	0.005**	< 0.001***
	NP	ND	< 0.001***	0.063	< 0.001***
		FD	< 0.001***	< 0.001***	< 0.001***
	ND	FD	0.005**	< 0.001***	< 0.001***

FP: far proximal; NP: near proximal; ND: near distal; FD: far distal; iBSC: integrate backscatter coefficient. NA since at the pre-surgery time point, the same group was applied for NP and ND groups.

*p < 0.05; **p < 0.01;***p < 0.001.