|
Characteristic
|
Visible on mammography and US
|
Visible only on US (mammography failure)
|
|---|
|
Mean or n
|
SD or %
|
Mean or n
|
SD or %
|
|---|
|
Age
|
60.2
|
12.5
|
52.5
|
12.1
|
|
BMI
|
26.4
|
4.7
|
23.7
|
3.5
|
|
PMD
|
34.5
|
18.3
|
51.3
|
20.5
|
|
Previous breast surgery
|
|
No
|
1080
|
87.4
|
79
|
80.6
|
|
Yes
|
156
|
12.6
|
19
|
19.4
|
|
Menopausal and HRT status
|
|
Premenopausal
|
269
|
21.8
|
46
|
46.9
|
|
Postmenopausal and no HRT
|
721
|
58.3
|
28
|
28.6
|
|
Postmenopausal and HRT
|
246
|
19.9
|
24
|
24.5
|
|
Imaging technique
|
|
Analog
|
761
|
61.6
|
55
|
56.1
|
|
Digital
|
475
|
38.4
|
43
|
43.9
|
- Mean and standard deviation (SD) are shown for continuous characteristics, and frequency and percentage for categorical characteristics
-
BMI body mass index, HRT hormone replacement therapy, PMD percentage mammographic density, US ultrasonography
