Table 1.

Baseline characteristics of patients in training and validation datasets

	Training (n = 218)	Validation 1 (n = 96)	Validation 2 (n = 69)	p
Age (years)	60.91 ± 11.94	62.38 ± 12.71	61.33 ± 13.07	0.627
Gender				0.570
Female	110 (50.46%)	43 (44.79%)	36 (52.17%)
Male	108 (49.54%)	53 (55.21%)	33 (47.83%)
Diameter (mm)	55.01 ± 40.64	54.96 ± 41.08	61.80 ± 42.43	0.461
Ki-67 PI				0.307
Ki-67 ≤ 10%	191 (87.61%)	87 (90.62%)	57 (82.61%)
Ki-67 > 10%	27 (12.39%)	9 (9.38%)	12 (17.39%)
CER (%)	2.26 ± 0.81	2.27 ± 0.77	2.24 ± 0.76	0.971

CER, contrast enhancement ratio; PI, proliferation index