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Table 4 Associations between breastfeeding duration and pubertal development, adjusted for prepubertal BMI: KPNC puberty study

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

Breastfeeding duration Breasta Pubic Haira
  N HR 95% CI N HR 95% CI
Not breastfed 497 1.18 1.01–1.38 470 1.13 0.96–1.34
< 6 months 1096 1.07 0.95–1.21 1023 1.12 0.98–1.28
≥6 months 1667 Ref   1587 Ref
  1. CI Confidence interval, HR Hazard ratio, KPNC Kaiser Permanente Northern California
  2. aAlso adjusted for maternal race/ethnicity, maternal age at delivery, education, and parity