Table 1.

Model‐based measure of association (κ _ma) for histological variables.

Histological variable	Model‐based weighted kappa (κ ma)	95% CI
DCIS grades 1, 2, and 3 (n = 411; intercept‐only model)	0.50	0.44–0.56
DCIS grades 1 and 2 versus 3 (n = 411)	0.51	0.43–0.59
DCIS grade 1 versus 2 and 3 (n = 411)	0.45	0.41–0.50
DCIS grade as binary, low versus high (n = 411)	0.52	0.45–0.59
Necrosis; absent versus present (n = 413, manually dichotomised)	0.55	0.51–0.59
Calcifications; absent versus present (n = 413)	0.51	0.48–0.55
Lymphocytic infiltrate; absent versus subtle versus prominent (n = 413)	0.47	0.38–0.55
Periductal fibrosis; absent versus subtle versus prominent (n = 413)	0.35	0.03–0.31
Mitoses; sparse versus many (n = 408)	0.33	0.24–0.42
Architectural pattern; solid and comedo versus cribriform, flat, and (micro)papillary (n = 413)	0.61	0.58–0.64

DCIS grade 1 denotes low grade, 2 intermediate grade, and 3 high grade.