Table 1.

Baseline characteristics of the included datasets

Data sets		Development set	Testing set	P
Reference standard	Malignant, No.	281	164	0.984
	Benign, No.	82	47
Gender	Male, No.	273	152	0.457
	Female, No.	90	59
Age	Mean ± SD, year	52.64 ± 13.77	54.30 ± 12.58	0.151
Lesion size	Mean ± SD, cm	5.10 ± 3.27	4.74 ± 4.05	0.245
No. of images		614,728 (augmented)	616	‐
Ultrasound devices	Types, No.	5	6	‐
CEUS examiners	No.	10	11	‐

CEUS, contrast‐enhanced ultrasound; No., number; SD, standard deviation.