. 2014 Sep 26;25(3):850–859. doi: 10.1007/s00330-014-3431-3

Table 2.

Tumour-related characteristics of cancers detected by screen-film mammography and full-field digital mammography

	Screen-film mammography		Digital mammography		p value
	n = 340^a	%	n = 334^a	%	p value
TNM stage
Stage 0 (in situ)	41	13.14	63	20.32
Stage I	156	50.00	157	50.65
Stage II	91	29.17	69	22.26
Stage III	21	6.73	19	6.13
Stage IV	3	0.96	2	0.65	0.092
Unknown^b	28		24
TNM stage (invasive only)
Stage I	156	57.56	157	63.56
Stage II	91	33.58	69	27.90
Stage III	21	7.74	19	7.70
Stage IV	3	1.11	2	0.80	0.528
Unknown^b	28		24
Tumour size (invasive only)
T1 (<20 mm)	188	69.37	194	78.90
T2 (20 to 50 mm)	58	21.40	32	13.00
T3 (>50 mm)	16	5.90	16	6.50
T4	9	3.32	4	1.60	0.040
Tx^b	28		24
Lymph node involvement (invasive only)
N0	197	72.70	181	73.28
N1–N3	74	27.30	66	26.72	0.959
Nx^b	28		24
Metastasis (invasive only)
M0	268	98.90	245	99.59
M1	3	1.10	2	0.81	0.730
Mx^b	28		24
Tumour grade
Ductal carcinoma in situ
I	8	19.51	11	18.97
II	12	29.27	12	20.69
III	21	51.22	35	60.34	0.581
Unknown^b	4		12
Invasive cancers
I	86	36.91	95	43.78
II	102	43.78	68	31.34
III	45	19.31	54	24.88	0.023
Unknown^b	62		47

^aThe number of in situ and invasive carcinomas is not the sum of overall cancers, because data are missing on some tumours (5 tumours in the SFM period and 5 tumours in the FFDM period)

^bTumours with missing information were excluded from the calculation of percentages