Table 1.
Characteristics of the study population N=118.
| Patient characteristics | |
|---|---|
|
| |
| Age at MRI (years) | |
| Median (IQR) | 57.0 (54.4, 61.8) |
|
| |
| Reason for MRI, N(%)a | |
| Abnormal screening mammogram | 19 (16.1) |
| Lump in breast | 5 (4.2) |
| High-risk breast cancer screening | 109 (92.4) |
| Other | 8 (6.8) |
|
| |
| Race/Ethnicity, N(%) | |
| White/Caucasian | 107 (90.7) |
| Black/African American | 7 (5.9) |
| Asian | 2 (1.7) |
| Other | 2 (1.7) |
|
| |
| Body mass index (BMI, kg/m2) | |
| Median (IQR) | 24.3 (22.0, 28.1) |
| <25 | 70 (59.3) |
| 25–<30 | 23 (19.5) |
| ≥30 | 25 (21.2) |
|
| |
| Age at menarche (years) | |
| Median (IQR) | 12.3 (12.0, 13.0) |
|
| |
| Parity, N(%) | |
| Nulliparous | 32 (27.1) |
| Parous | 86 (72.9) |
|
| |
| First degree family history of breast cancer, N(%) | |
| No | 33 (28.0) |
| Yes | 84 (71.2) |
| Unknown | 1 (0.8) |
|
| |
| BRCA mutation status, N(%)b | |
| Negative | 22 (18.6) |
| Positive | 25 (21.2) |
| Unknown | 71 (60.2) |
|
| |
| Bilateral oophorectomy, N(%) | |
| No | 78 (66.1) |
| Yes | 40 (33.9) |
|
| |
| Number of drinks per week, N(%) | |
| None | 28 (23.7) |
| <7 | 73 (61.9) |
| ≥7 | 17 (14.4) |
|
| |
| Smoking status at MRI, N(%) | |
| No | 116 (98.3) |
| Yes | 2 (1.7) |
Abbreviations: IQR: inter-quartile range.
a
Women were asked to indicate all that apply. ‘Other’ category includes women with a personal history of atypical hyperplasia or LCIS
b
BRCA positive women includes those who were BRCA1 positive (n=14), BRCA2 positive (n=10), and a single carrier with a BRCA1 variant of unknown significance.