Table 3 OR (95% CI) of combined effect of paternal age and maternal ages on risk of breast cancer [cases/controls]

<30

1.0

[230/273]

1.3 (0.97–1.81)

[122/116]

1.1 (0.45–2.86)

[9/10]

1.1 (0.07–17.69)

[1/1]

30–34

1.2 (0.76–1.87)

[46/47]

1.3 (0.96–1.76)

[132/127]

1.3 (0.91–1.89)

[81/79]

1.1 (0.38–2.97)

[7/8]

35–39

1.6 (0.55–4.81)

[8/6]

1.1 (0.67–1.70)

[41/46]

1.4 (1.00–2.07)

[83/74]

0.9 (0.55–1.42)

[37/48]

≥40

0.3 (0.04–3.07)

[1/4]

1.2 (0.43–3.60)

[7/8]

2.8 (1.74–4.62)

[64/29]

1.3 (0.96–1.75)

[142/135]