Table 1. Baseline characteristics and methodological quality of all included studies.

First author	Year	Country	Language	Sample size	Age(Years)	Instrument	TI-RADS 2×2 table					TI-RADS+SMI 2×2 table				QUADAS score
							TP	FP	FN	TN	TP		FP	FN	TN
Zhao YF [11]	2019	China	Chinese	296	——	Toshiba Ap1io500	109	30	35	122	124		17	15	140	23
Huang JY [12]	2019	China	Chinese	68	40.1±11.1	Toshiba Ap1io500	41	6	2	19	39		3	4	22	23
Zhang PS [13]	2019	China	Chinese	121	55.6±9.0	Toshiba Ap1io500	27	6	16	72	36		4	7	74	22
LI YH [14]	2017	China	Chinese	254	39.0±16.5	Toshiba Ap1io500	64	47	9	134	65		16	18	165	23
Ahn HS [15]	2018	Korea	English	52	51.6±11.2	Toshiba Ap1io500	21	3	5	23	25		7	1	19	24
Kong J [16]	2017	China	English	113	42(20–75)	Toshiba Ap1io400	62	4	17	30	63		5	16	29	24

TP true positive, TN true negative, FP false positive, FN false negative, QUADAS the quality assessment of studies of diagnostic accuracy studies.