Table 4

Associations with the presence of prompts in the region of interest (ROI)

Study group
Factor
Category
CAD prompt (n (%))
Average prompt size







No
Yes
Mass
Calcification

Normal cases
Breast density
<11%
90 (45)
100 (55)
17
10


11% to 25%
89 (32)
191 (68)
16
11


26% to 50%
72 (33)
149 (67)
16
11


51% to 75%
41 (34)
78 (66)
15
13


76% or more
14 (34)
27 (66)
16
11
Cancer cases with a prompt in ROI
Breast densitya
<11%
27 (90)
3 (10)
20
-b


11% to 25%
45 (71)
18 (29)
18
13


26% to 50%
66 (54)
57 (46)
17
13


51% to 75%
42 (56)
33 (44)
19
14


76% or more
13 (68)
6 (32)
19
15

Detection statusa
Original 1996 screen
5 (6)
80 (94)
18
14


Interval cancer (1 year)
4 (57)
3 (43)
-b
12


Interval cancer (2 to 3 years)
29 (69)
13 (31)
15
14

aThree cancer cases with a missing prompt location, a further two cases with missing density. bNo observations in this category.

Gilbert et al. Breast Cancer Research 2008 10:R72   doi:10.1186/bcr2137