Table 2 Long-term relative risk of breast cancer after an early age childbirth compared with one childbirth less, according to the duration of pregnancy and type of childbirth in the Danish cohort

From: Pregnancy duration and breast cancer risk

Type of childbirtha

Duration of Pregnancy

<34 weeks

≥34 weeks

Unadjusted for socioeconomic factors

 Live birth

0.99 (0.87–1.12)

0.87 (0.86–0.89)

 Stillbirth

0.84 (0.54–1.30)

0.69 (0.51–0.94)

Adjusted for socioeconomic factors b

 Live birth

0.99 (0.87–1.12)

0.87 (0.85–0.88)

 Stillbirth

0.84 (0.54–1.30)

0.69 (0.51–0.94)

  1. Unadjusted and adjusted for socioeconomic factors (with corresponding 95% confidence intervals)
  2. aOf the total number of childbirths in the Danish cohort with known duration of pregnancy 3442 (0.18%) were stillbirths before week 34, 5970 (0.31%) were stillbirths at week 34 or later, 30,437 (1.56%) were live births before week 34 and 1,912,529 (97.96%) were live births at week 34 or later
  3. bAdjustment for disposable household income, level of educational attainment, and employment status
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