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Table 1 Characteristics of DISC participants in childhood and as young adults
From: Pubertal timing and breast density in young women: a prospective cohort study
| Number | Mean | SD | Percentage | |
|---|---|---|---|---|
| Child characteristics | ||||
| Race/ethnicity | ||||
| White | 164 | 90 | ||
| Other | 18 | 10 | ||
| Age at baseline, years | 182 | 9.13 | 0.59 | |
| BMI z-score at baseline | 182 | 0.23 | 0.90 | |
| Age at thelarche, years | 170 | 10.59 | 1.09 | |
| Age at pubarche, years | 173 | 10.97 | 1.19 | |
| Age at menarche, years | 182 | 12.90 | 1.26 | |
| Adult characteristics | ||||
| Age at follow-up, years | 182 | 27.17 | 1.02 | |
| BMI, kg/m2 | 182 | 25.39 | 5.36 | |
| DXA % body fat, % | 176 | 35.41 | 8.82 | |
| Exogenous hormone use | ||||
| Never | 11 | 6 | ||
| Former | 66 | 36 | ||
| Current | 105 | 58 | ||
| Duration of hormone use, years | 171 | 5.6 | 3.5 | |
| Parous (vs nulliparous) | 53/182 | 29 | ||
| Education | ||||
| Graduate degree | 25 | 14 | ||
| Bachelor’s degree | 95 | 52 | ||
| Some college or less | 62 | 34 | ||
| Ever smokers (vs never-smokers) | 82/182 | 45 | ||
| Breast density measures | ||||
| Percent dense breast volume (%) | 182 | 27.6 | 20.5 | |
| Absolute dense breast volume (cm3) | 182 | 104.2 | 70.6 | |
| Absolute non-dense breast volume (cm3) | 182 | 413.3 | 364.3 | |
