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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

Factor

Number of cases

Unadjusted HR

Number of cases

Adjusted HRa

Number of cases

Adjusted HRb

Age at first birth

765

685

382

Nullipara

83

1.33 (0.69–2.53)

82

1.58 (0.51–4.89)

50

1.42 (0.16–12.26)

< 20

114

1.00

113

1.00

72

1.00

21 to  ≤ 25

252

0.76 (0.43–1.33)

240

0.64 (0.35–1.15)

120

0.58 (0.26–1.32)

26 to  ≤ 30

188

0.70 (0.38–1.28)

179

0.67 (0.35–1.27)

96

0.88 (0.38–2.02)

> 30

74

0.69 (0.31–1.53)

71

0.80 (0.33–1.90)

36

0.59 (0.19–1.81)

Missing

54

1.27 (0.60–2.68)

18

1.43 (0.34–5.97)

8

0.49 (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