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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