Ultrasound grayscale ratio: a reliable parameter for differentiating between papillary thyroid microcarcinoma and micronodular goiter

Table 1 Comparisons of UGSR for distinguishing PTMC from MNG in different groups

Group	Number		UGSR		t	P
Group	PTMC	MNG	PTMC	MNG	t	P
Outpatient examination	265	168	0.56±0.14	0.80±0.19	5.84	<0.001
Preoperative positioning	265	168	0.55±0.14	0.80±0.19	18.74	<0.001
Mean value	265	168	0.56±0.12	0.80±0.18	16.49	<0.001

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