Table 4

Multivariate model of mortality according to time since last pregnancy and tumor characteristics

HR1aHR2bHR3c
Time since last birth
 5+ yrs1.3 (0.9–1.8)1.4 (0.9–1.9)1.5 (1.0–2.3)
 2–<5 yrs1.5 (0.9–2.4)1.5 (0.9–2.4)2.2 (1.3–3.6)
 <2 yrs2.7 (1.7–4.2)2.4 (1.5–3.8)2.7 (1.6–4.3)
Tumor size
 >2–5 cm1.5 (1.1–2.0) d
 >5 cm2.0 (1.3–3.2)
Node positive2.9 (2.2–4.0)
AJCC stage
 IIA1.7 (1.2–2.6)2.0 (1.2–3.2)
 IIB3.5 (2.4–5.3)4.1 (2.5–6.7)
 IIIA+6.0 (3.9–9.1)7.2 (4.3–12.2)
PR negative1.9 (1.4–2.5)1.8 (1.4–2.4)1.8 (1.3–2.4)
Positive c-erbB-21.6 (1.2–2.1)1.6 (1.2–2.1)1.5 (1.2–2.1)
Positive p531.2 (1.0–1.6)1.3 (1.0–1.7)1.3 (1.0–1.8)
Any radiation0.9 (0.7–1.2)
Any chemo0.8 (0.5–1.2)
Any hormonal therapy0.9 (0.6–1.3)
  • a HR1: n = 805, adjusted for age, diagnosis year, and all other variables in the model.

  • b HR2: n = 812, adjusted for age, diagnosis year, and all other variables in the model.

  • c HR3: n = 656, adjusted for age, diagnosis year, and all other variables in the model.

  • d Information not entered indicates not in model.