Table 4.

Agreement of invasive and non-invasive cancer histologies in the regional cancer registries of England in participants of the Million Women Study

Region	Number of casesa	Percentage agreement	κ value
A	1,830	0.96	0.87
B	737	0.97	0.91
C	691	0.97	0.92
D	490	0.95	0.82
E	486	0.94	0.85
F	485	0.96	0.89
G	410	0.98	0.93
H	389	0.97	0.94
I	189	0.97	0.86
J	180	0.88	0.66

^aVariation in the number of cases is a reflection of the variation in the number of participating breast cancer screening centres within each region.