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Table 2 Risks of breast-cancer-specific and overall survival according to age at first pregnancy stratified by menopausal status

From: Effects of interval between age at first pregnancy and age at diagnosis on breast cancer survival according to menopausal status: a register-based study in Korea

 

Premenopausal

Postmenopausal

Case

Events

HR (95% CI)

Case

Events

HR (95% CI)

AFP

Breast cancer specific survival

Nulliparous

4441

269

Ref

502

17

Ref

<20

202

5

0.436 (0.180-1.057)

318

18

1.492 (0.769-2.896)

20-24

3756

100

0.429 (0.341-0.540)

2897

116

1.090 (0.655-1.813)

25-29

8114

193

0.376 (0.312-0.452)

2809

88

0.834 (0.496-1.403)

≥30

2178

51

0.372 (0.275-0.501)

693

38

1.508 (0.851-2.673)

p-value

  

<.0001

  

0.0172

AFP

Overall survival

Nulliparous

4441

561

Ref

502

47

Ref

<20

202

16

0.672 (0.409-1.105)

318

49

1.404 (0.941-2.095)

20-24

3756

274

0.551 (0.477-0.637)

2897

332

1.076 (0.793-1.460)

25-29

8114

513

0.468 (0.415-0.528)

2809

231

0.748 (0.546-1.023)

≥30

2178

159

0.547 (0.459-0.653)

693

87

1.183 (0.830-1.687)

p-value

  

<.0001

  

<.0001