Table 4.

Matched concordance index (mC)

	Study 1			Study 2
	mCa	95% CI		mCb	95% CI
VAS (%)	0.651	0.611	0.691	0.647	0.607	0.688
Volpara breast density (%)	0.571	0.528	0.618	0.575	0.534	0.615
Volpara gland volume (cm3)	0.553	0.513	0.591	0.586	0.546	0.627
Quantra breast density (%)	0.510	0.469	0.552	0.543	0.504	0.584
Quantra gland volume (cm3)	0.487	0.447	0.528	0.531	0.490	0.574
Densitas breast density (%)	0.571	0.526	0.612	0.587	0.548	0.628
Densitas dense area (cm2)	0.535	0.496	0.574	0.577	0.537	0.616
Cumulus breast density (%)	0.582	0.541	0.623	-	-	-
Cumulus dense area (cm2)	0.558	0.516	0.599	-	-	-

CI confidence interval, VAS visual analogue scale

^aStudy 1: 239 cases with 3 controls, 62 with 2 controls, 2 with 1 control

^bStudy 2: 296 with 3 controls, 31 with 2 controls, 2 with 1 control