Table 1.

Demographics in cancer cases.

	Train (n = 3101)	Validation (n = 619)	Test (n = 619)	P value
Density				0.7843
almost entire fat	196 (6.32)	32 (5.2)	31 (5.0)
scattered fibroglandular densities	640 (20.6)	136 (22.0)	137 (22.1)
heterogeneous dense	1555 (50.2)	312 (50.4)	312 (50.4)
extremely dense	710 (22.9)	139 (22.4)	139 (22.5)
Age				0.9941
≥50	1759 (56.7)	350 (56.5)	350 (56.5)
<50	1342 (43.3)	269 (43.5)	269 (43.5)
Manufacturer				0.9351
GE	1226 (39.5)	238 (38.5)	251 (40.6)
Hologic	1032 (33.2)	200 (32.3)	198 (32.0)
Siemens	843 (27.2)	181 (29.2)	170 (27.4)
Feature
mass	1688 (54.4)	339 (54.8)	339 (54.8)	0.9806
non mass	1413 (45.6)	280 (45.2)	280 (45.2)
calcifications	1402 (45.2)	280 (45.2)	280 (45.2)	0.9999
non calcifications	1699 (54.8)	339 (54.8)	339 (54.8)
Type				0.2767
Invasive	2673 (86.2)	542 (87.56)	547 (88.37)
Noninvasive	428 (13.8)	77 (12.44)	72 (11.63)
Size (invasive)				0.8409
Size ≥20	1216 (45.5)	254 (46.9)	251 (45.9)
Size <20	1457 (54.5)	288 (53.1)	296 (54.1)