Table 2. Distribution of cases according to studied mammographic features.

	CO (%)	IC (%)	SDC (%)
Wolfe pattern
N1	41 (11.4)	6 (7.5)	27 (8.1)
P1	174 (48.3)	28 (35.0)	98 (29.4)
P2	120 (33.3)	48 (48.7)	176 (52.9)
Dy	25 (7.0)	9 (8.8)	32 (9.6)
Density (I)
0%	36 (10.0)	2 (2.2)	26 (7.8)
1–25%	173 (48.1)	29 (32.2)	96 (28.8)
26–74%	133 (36.9)	34 (37.8)	187 (56.2)
>74%	18 (5.0)	25 (27.8)	24 (7.2)
Density (II)
0–25%	209 (58.1)	31 (34.4)	122 (36.6)
26–60%	97 (26.9)	24 (26.7)	138 (41.4)
61–74%	36 (10.0)	10 (11.1)	49 (14.7)
>74%	18 (5.0)	25 (27.8)	24 (7.2)
Density quartiles
25%	10	25	20
50%	25	50	40
75%	50	75	60
Mammographic views
1	240 (66.7)	51 (56.7)	190 (57.4)
2	120 (33.3)	39 (43.3)	141 (42.6)
Screening round
First	14 (3.9)	11 (12.2)	63 (18.2)
Repeat	346 (96.1)	79 (78.8)	283 (81.8)

SDC=screen-detected cancer; IC=interval cancers; CO=healthy controls.