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Associations between breastfeeding duration and timing of breast development in daughters: KPNC puberty study (N=3,270)
| Breastfeeding durationa | n | TR | 95% CI | HR | 95% CI |
|---|---|---|---|---|---|
| Not breastfed | 499 | 0.98 | 0.96–0.99 | 1.25 | 1.07–1.46 |
| < 6 months | 1102 | 0.99 | 0.98–1.00 | 1.09 | 0.97–1.22 |
| ≥ 6 months | 1669 | Ref | Ref |
CI Confidence interval, HR Hazard ratio, KPNC Kaiser Permanente Northern California, TR Time ratio
aAdjusted for maternal race/ethnicity, maternal age at delivery, education, and parity
