Table 2. Non-blinded vs blinded double reading at screening mammography: assessment following referral.

	Proportion					Rate (per 1000 screened women)
	Non-blinded (n=1235)		Blinded (n=1474)		P-value	Non-blinded (n=42 996)	Blinded (n=44 491)	P-value
Assesment following referral	n	(%)	n	(%)
No further assessment	3	(0.2)	0	(0)	—	0.1	0	—
Additional breast imaging	618	(50.0)	698	(47.4)	0.164	14.4	15.7	0.110
Additional breast imaging + FNAB	29	(2.3)	36	(2.4)	0.873	0.7	0.8	0.465
Additional breast imaging + CNB	259	(21.0)	333	(22.6)	0.310	6.0	7.5	0.008
Additional breast imaging + SCNB	285	(23.1)	362	(24.6)	0.368	6.6	8.1	0.009
Additional breast imaging + FNAC + CNB/SCNBa	16	(1.3)	18	(1.2)	0.862	0.4	0.4	0.808
Additional breast imaging + CNB/FNAB/SCNBb + SB	16	(1.3)	14	(0.9)	0.392	0.4	0.3	0.646
Additional breast imaging + CNB +SCNB	8	(0.6)	12	(0.8)	0.614	0.2	0.3	0.413
Additional breast imaging + SB	1	(0.1)	1	(0.1)	—	0	0	—

Abbreviations: CNB=core needle biopsy; FNAB=fine needle aspiration biopsy; SB=surgical (open) biopsy; SCNB=stereotactic CNB.

^aCNB and/or SCNB.

^bCNB and/or FNAB and/or SCNB.