Table 2.
Age adjusted and multivariable PR and 95% CI for preterm birth, low birthweight, and small for gestational age
| Preterm birth (<37 weeks) | Low birthweight (<2500 g) | Small for gestational age (<10th percentilec) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| n | Age adjusteda
PR (95% CI) |
Multivariableb
PR (95% CI) |
n | Age adjusteda
PR (95% CI) |
Multivariableb
PR (95% CI) |
n | Age adjusteda
PR (95% CI) |
Multivariableb
PR (95% CI) |
|
| Breast cancer history | |||||||||
| Nod | 206,026 | 1.00 | 1.00 | 168,432 | 1.00 | 1.00 | 213,188 | 1.00 | 1.00 |
| Yes | 108 | 1.89 (1.60–2.24) | 1.67 (1.42–1.97) | 76 | 1.76 (1.43–2.16) | 1.50 (1.23–1.84) | 68 | 1.48 (1.19–1.85) | 1.30 (1.05–1.61) |
| Chemotherapy | |||||||||
| No | 38 | 1.31 (0.98–1.76) | 1.17 (0.87–1.56) | 28 | 1.28 (0.90–1.82) | 1.10 (0.78–1.55) | 26 | 1.14 (0.79–1.64) | 0.98 (0.68–1.40) |
| Yes | 70 | 2.48 (2.03–3.03) | 2.17 (1.79–2.63) | 48 | 2.24 (1.73–2.89) | 1.92 (1.50–2.45) | 42 | 1.83 (1.39–2.40) | 1.63 (1.25–2.13) |
| Time between diagnosis and delivery | |||||||||
| <2 years | 62 | 2.86 (2.33–3.52) | 2.58 (2.12–3.15) | 38 | 2.29 (1.72–3.04) | 2.16 (1.64–2.85) | 26 | 1.43 (1.00–2.04) | 1.36 (0.96–1.92) |
| 2–4.9 years | 30 | 1.36 (0.98–1.90) | 1.20 (0.86–1.66) | 20 | 1.20 (0.79–1.82) | 0.98 (0.65–1.47) | 21 | 1.20 (0.80–1.79) | 0.97 (0.66–1.44) |
| ≥5 years | 16 | 1.19 (0.75–1.87) | 1.04 (0.66–1.63) | 18 | 1.79 (1.17–2.74) | 1.49 (0.98–2.26) | 21 | 2.08 (1.41–3.06) | 1.85 (1.27–2.71) |
aAdjusted for mother’s age at infant delivery
bAdjusted for mother’s age at infant delivery, education, marital status, parity, race/ethnicity, and smoking
cBirthweight of infant is below the tenth percentile for the infant’s gestational age and sex
dWomen with no breast cancer history serve as the reference group for all comparisons
CI confidence interval, PR prevalence ratio