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. 2022 Dec 19;24:91. doi: 10.1186/s13058-022-01588-y

Table 1.

Characteristics of participants (N = 182)

Child characteristics Mean (sd)
Age (year) 11.63 (2.13)
BMI Z-score 0.34 (0.93)
Age at menarche (year) 12.90 (1.26)
N (%)
Race
 White 164 (90%)
 Nonwhite 18 (10%)
Days until start of next menses at blood collection
 Premenarche 134 (74%)
 Postmenarche
  ≤ 14 days (luteal) 14 (8%)
  > 14 days (follicular) 19 (10%)
  Unknown 15 (8%)
Treatment group
 Intervention 87 (48%)
 Usual care 95 (52%)
Young adult characteristics Mean (sd)
Age (year) 27.17 (1.02)
BMI (kg/m2) 25.39 (5.36)
Duration hormone use (year) 5.27 (3.65)
N (%)
Education
 High school or equivalent 18 (10%)
 Some college 44 (24%)
 College graduate 95 (52%)
 Graduate school 25 (14%)
Hormonal contraceptive use
 Current 105 (58%)
 Former 66 (36%)
 Never 11 (6%)
Number live births
 0 129 (71%)
 1 30 (16%)
 2+ 23 (13%)
Smoking status
 Current 44 (24%)
 Former 38 (21%)
 Never 100 (55%)
Breast phenotypes Mean (sd)
Breast density (%) 27.64 (20.48)
Dense breast volume (cm3) 104.18 (70.64)
Non-dense breast volume (cm3) 413.25 (364.27)