Table 3.
PR and 95% CI for preterm birth, low birthweight, and small for gestational age stratified by race/ethnicity
| Race/ethnicity | Breast cancer history | Preterm birtha (<37 weeks) | Low birthweighta (<2500 g) | Small for gestational agea (<10th percentilec) | |||
|---|---|---|---|---|---|---|---|
| n | PR (95% CI)b | n | PR (95% CI)b | n | PR (95% CI)b | ||
| Black, non-Hispanic | No | 75,286 | 1.00 | 71,159 | 1.00 | 90,006 | 1.00 |
| Yes | 40 | 1.31 (1.00–1.72) | 41 | 1.49 (1.14–1.94) | 41 | 1.44 (1.11–1.87) | |
| White, non-Hispanic | No | 130,740 | 1.00 | 97,273 | 1.00 | 123,182 | 1.00 |
| Yes | 68 | 2.06 (1.67–2.54) | 35 | 1.53 (1.12–2.08) | 27 | 1.10 (0.77–1.58) | |
| Black, non-Hispanicd | No | 75,286 | 1.45 (1.44–1.47) | 71,159 | 1.82 (1.80–1.84) | 90,006 | 1.82 (1.80–1.83) |
| Yes | 40 | 1.90 (1.45–2.50) | 41 | 2.71 (2.08–3.54) | 41 | 2.62 (2.01–3.40) | |
a P interaction of race/ethnicity and breast cancer history is 0.01 for preterm birth, 0.9 for low birthweight, and 0.2 for small for gestational age
bAdjusted for mother’s age at infant delivery, education, marital status, parity, and smoking
cBirthweight of infant is below the tenth percentile for the infant’s gestational age and sex
dWhite women with no breast cancer history serve as the reference group for these comparisons
CI confidence interval, PR prevalence ratio