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Table 5 Association between breastfeeding duration and pubertal onset, stratified by maternal race/ethnicity: KPNC puberty study (N = 3331)

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

Race/Ethnicity n Breastfed
≥6 months
Breastfed
<  6 months
Not breastfed
HR HR 95% CI HR 95% CI
Breast developmenta
 Non-Hispanic White 1387 Ref 1.15 0.95–1.40 1.19 0.92–1.56
 African American 243 Ref 1.63 0.96–2.77 1.92 1.01–3.66
 Asian/Pacific Islander 780 Ref 1.00 0.76–1.31 1.32 0.92–1.89
 Hispanic 860 Ref 0.99 0.75–1.30 1.21 0.86–1.71
 Combined 3270 Ref 1.09 0.97–1.22 1.25 1.07–1.46
Pubic hair developmenta
 Non-Hispanic White 1311 Ref 1.30 1.06–1.60 1.17 0.88–1.56
 African American 227 Ref 0.99 0.48–2.02 1.14 0.51–2.52
 Asian/Pacific Islander 740 Ref 1.24 0.94–1.64 1.33 0.93–1.91
 Hispanic 809 Ref 0.88 0.67–1.16 1.30 0.93–1.82
 Combined 3087 Ref 1.14 1.00–1.30 1.24 1.05–1.46
  1. CI Confidence interval, HR Hazard ratio, KPNC Kaiser Permanente Northern California
  2. aAdjusted for maternal age at delivery, education, and parity