Table 5. Criteria for Dworak grades 1, 2 vs 3, 4, and their validities tested among the 60 patients.

			Pathological response		Validity
			DG 3, 4	DG1, 2	DG 3, 4		DG 1, 2
Category	Definition (P)	Definition (Π)	Responder (n=29)	Non-responder (n=31)	Se	Sp	Se	Sp
Responder	0.90⩽P	2.20⩽Π	13	0	44.8	100
Probable responder	0.50⩽P<0.90	0⩽Π<2.20	11	5	82.8	83.9
Unknown	0.40⩽P<0.50	−0.41<Π<0	1	1
Probable no-responder	0.20<P⩽0.40	−1.39<Π⩽−0.41	4	7			80.6	86.2
No-responder	P⩽0.20	Π⩽−1.39	0	18			58.1	100

P, probability; DG, Dworak grade; Se, sensitivity; Sp, specificity; Π=log_e (P/1−P).