Table 3 Relative risks of breast cancer within 3 years of a negative mammographic screening result in relation to use of hormone replacement therapy, family history of breast cancer, and mammographic features

Current use of HRT (same-year user vs. previous or nonuser)

1.4 (0.9–2.1)

1.3 (0.9–2.0)

Family history of breast cancer

1.3 (1.1–1.7)

1.3 (1.0–1.7)

Percentage mammographic density (cBIRADS 4 vs. 1)

4.9 (2.8–8.6)

4.8 (2.6–8.8)

Percentage mammographic density (per SD)

1.6 (1.4–1.8)

1.6 (1.4–1.8)

Number of microcalcifications^c (category 4 vs. 0)

2.0 (1.3–3.1)

2.0 (1.3–3.2)

Number of masses (4 vs. 0)

1.7 (0.8–3.5)

1.7 (0.8–3.5)

 Percentage mammographic density

3.4 (2.2–5.2)

1.9 (1.2–3.0)

 Number of microcalcifications

2.5 (1.9–3.1)

2.8 (1.8–4.5)

 Number of masses

1.4 (0.9–2.2)

1.1 (0.6–1.9)