From: Childhood body size and pubertal timing in relation to adult mammographic density phenotype
 | Participants | ||
---|---|---|---|
Characteristic | Adjusted mean percentage densitya | Number | Percentage of subjects |
Age at mammogram, years | |||
 47–54 | 25.5 | 303 | 27.4 |
 55–59 | 21.3 | 344 | 31.1 |
 60–64 | 18.0 | 279 | 25.2 |
 65–73 | 16.6 | 179 | 16.2 |
Interval between mammogram and baseline questionnaire | |||
 ≥3 years prior | 21.6 | 47 | 4.3 |
 2–2.9 years prior | 24.3 | 61 | 5.5 |
 1–1.9 years prior | 24.0 | 182 | 16.5 |
 Within 1 year | 21.1 | 554 | 50.1 |
 1–1.9 years later | 19.3 | 127 | 11.5 |
 2–2.9 years later | 22.0 | 59 | 5.3 |
 ≥3 years later | 17.2 | 75 | 6.8 |
BMI at baseline questionnaire, kg/m 2 | |||
 <20 | 33.0 | 39 | 3.5 |
 20–24 | 25.6 | 525 | 47.5 |
 25–29 | 15.7 | 378 | 34.2 |
 ≥30 | 12.1 | 163 | 14.8 |
Menopausal status at mammogram | |||
 Postmenopausal | 20.5 | 885 | 80.1 |
 Premenopausal | 24.5 | 126 | 11.4 |
 Status not known | 23.2 | 94 | 8.5 |
Parity | |||
 Nulliparous | 24.5 | 113 | 10.2 |
 Parous | 20.9 | 992 | 89.8 |
   Age at first birth, years | |||
   <25 | 19.9 | 428 | 38.7 |
   25–29 | 21.4 | 414 | 37.5 |
   ≥30 | 22.4 | 150 | 13.6 |
   Number of births |  |  |  |
   1 | 19.7 | 100 | 9.0 |
   2 | 21.1 | 583 | 52.8 |
   ≥3 | 21.0 | 309 | 28.0 |
Postmenopausal hormone replacement at time of mammogram | Â | ||
 Never | 21.0 | 839 | 75.9 |
 Former | 21.0 | 199 | 18.0 |
 Current | 25.7 | 67 | 6.1 |
Total study population | 21.3 | 1105 | 100.0 |