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Table 2 Risk of death in breast cancer

From: Age at first childbirth and breast cancer survival: a prospective cohort study

FactorNumber of casesUnadjusted HRNumber of casesAdjusted HRaNumber of casesAdjusted HRb
Age at first birth765685382
Nullipara831.33 (0.69–2.53)821.58 (0.51–4.89)501.42 (0.16–12.26)
< 201141.001131.00721.00
21 to  ≤ 252520.76 (0.43–1.33)2400.64 (0.35–1.15)1200.58 (0.26–1.32)
26 to  ≤ 301880.70 (0.38–1.28)1790.67 (0.35–1.27)960.88 (0.38–2.02)
> 30740.69 (0.31–1.53)710.80 (0.33–1.90)360.59 (0.19–1.81)
Missing541.27 (0.60–2.68)181.43 (0.34–5.97)80.49 (0.34–7.38)
  1. a95% CI for HR. Adjusted for socioeconomic status, alcohol consumption, age at baseline, age at menarche, age at menopause, BMI, parity and smoking
  2. b95% CI for HR. Adjusted for all the factors stated above and for tumor size, lymph node status, grade, ER, HER2, PgR, Ki67, Cyclin D1 and p27