From: Screening with magnetic resonance imaging, mammography and ultrasound in women at average and intermediate risk of breast cancer
Number
Percent
Age at study entry
40–49
1022
34.1%
50–59
1537
51.3%
60+
436
14.6%
Mean age
52.5
Family history
Positive
458
15.3%
Negative
2537
84.7%
Chek2 mutation
Truncating
48
1.6%
Missense
308
10.4%
Either
356
12.0%
Neither
2616
88.0%
Missing
23