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Table 1 Demographic characteristics of 429 Chilean girls participating in GOCS and included in this analysis

From: Inverse association between estrogen receptor-α DNA methylation and breast composition in adolescent Chilean girls

Covariate Breast Tanner stage Demographics
Age at visit, years B2 n 256
  Median 10.1
  25th–75th percentiles 9.4–10.8
B4 n 358
  Median 11.1
  25th–75th percentiles 10.6–11.8
Fibroglandular volume (% DV/BV) FGV n 345
  Median 76.8
  25th–75th percentiles 58.7–98.4
BV n 345
  Median 200.5
  25th–75th percentiles 144.7–278.7
%FGV n 345
  Median 37.9
  25th–75th percentiles 27.2–53.4
Age at menarche, years   n 379
  Median 11.9
  25th–75th percentiles 11.2–12.4
Fat percentage at Tanner 4   n 357
  Median 26.0
  25th–75th percentiles 22.5–29.8
Maternal education Completed secondary n 328
  % 76.5
Completed post-secondary n 101
  % 23.5
ER-α methylation B2 n 256
  Median 6.0
  25th–75th percentiles 4.0–8.8
B4 n 338
  Median 7.0
  25th–75th percentiles 4.3–9.4