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Table 2 Associations between breastfeeding duration and timing of breast development in daughters: KPNC puberty study (N=3,270)

From: Breastfeeding and timing of pubertal onset in girls: a multiethnic population-based prospective cohort study

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  
  1. CI Confidence interval, HR Hazard ratio, KPNC Kaiser Permanente Northern California, TR Time ratio
  2. aAdjusted for maternal race/ethnicity, maternal age at delivery, education, and parity