Table 2

Interobserver agreement for three categories: κ values

	Cytology		Necrosis		Van Nuys
kappa	κu	κw	κu	κw	κu	κw
κu, unweighted κ; κw, weighted κ.
Overall	0.36	0.47	0.47	0.57	0.4	0.48
Specialists	0.36	0.46	0.43	0.53	0.39	0.48
Non-specialists	0.38	0.49	0.51	0.61	0.44	0.51