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Associations between breastfeeding duration and timing of pubic hair development in daughters: KPNC puberty study (N=3,087)
| Breastfeeding durationa | N | TR | 95% CI | HR | 95% CI |
|---|---|---|---|---|---|
| Not breastfed | 470 | 0.98 | 0.96–1.00 | 1.24 | 1.05–1.46 |
| < 6 months | 1028 | 0.99 | 0.97–1.00 | 1.14 | 1.00–1.30 |
| ≥ 6 months | 1589 | 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
