Table 1.
Characteristics of the study population (n = 1040) at blood draw and study entry
| Characteristic | No. | Mean (SD) or % |
| Age at blood draw, years | 1040 | 57.9 (9.3) |
| BMI at study entry, kg/m2 | 1040 | 25.3 (4.0) |
| Age at menarche, years | 1016 | 13.2 (1.5) |
| Ever use of contraceptives, % | 1028 | 83.9 |
| Number of births, n | 1039 | 1.9 (1.1) |
| Age at first birth, years | 921 | 26.8 (5.2) |
| Postmenopausal, n | 705 | 67.8 |
| Age at menopause, years | 371 | 49.6 (5.4) |
| Alcohol consumption, g/day | 1035 | 6.9 (8.3) |
| Physical activity, MET-h/d | 1040 | 42.4 (6.4) |
| Previous use of MHT, % | 1040 | 24.4 |
| Mammographic features | ||
| Mammographic density, dense area, cm2 | 1040 | 24.9 (22.2) |
| Mammographic density change, dense area, cm2/year | 1040 | − 0.8 (3.3) |
| Circulating hormones | Median (SD) | |
| Progestogens | ||
| Pregnenolone, ng/mL | 718 | 5.3 (10.2) |
| Progesterone, ng/mL | 905 | 3.9 (22.4) |
| 17OH-progesterone, ng/mL | 910 | 2.1 (11.4) |
| Androgens | ||
| DHEA, ng/mL | 768 | 22.0 (45.2) |
| DHEAS, μg/mL | 974 | 1.8 (2.2) |
| Androstenedione, ng/mL | 817 | 4.8 (24.6) |
| Testosterone, ng/mL | 829 | 2.0 (11.1) |
| Free testosterone, pg/mL | 824 | 46.6 (312.0) |
| Androsterone, ng/mL | 711 | 13.1 (17.0) |
| Etiocholanolone, ng/mL | 654 | 6.1 (10.4) |
| Oestrogens | ||
| Oestrone, ng/mL | 450 | 6.3 (21.5) |
| Oestrone sulphate, ng/mL | 938 | 7.1 (21.3) |
| Corticoids | ||
| Corticosterone, ng/mL | 915 | 4.1 (14.4) |
| Aldosterone, ng/mL | 565 | 0.8 (2.5) |
| 11-Deoxycortisol, ng/mL | 866 | 3.2 (15.1) |
| Cortisol, ng/mL | 914 | 128.8 (61.7) |
| Cortisone, ng/mL | 909 | 44.7 (35.1) |
| Peptide hormones and proteins | ||
| Prolactin, ng/mL | 1035 | 15.4 (14.2) |
| SHBG, μg/mL | 1034 | 4.1 (2.4) |
BMI body mass index, DHEA dehydroepiandrosterone, DHEAS dehydroepiandrosterone sulphate, MET metabolic equivalent of task, MHT menopausal hormone therapy, SD standard deviations, SHBG sex hormone-binding globulin