Table 1.
Characteristics of the SWAN study sample at baseline visit
| Baseline characteristic | Value |
|---|---|
| Age (years) | 45.8 ± 2.7 |
| Race/ethnicity | |
| Non-Hispanic White | 1,420 (48) |
| Black | 803 (27) |
| Japanese | 274 (9) |
| Chinese | 240 (8) |
| Hispanic | 215 (7) |
| Education | |
| High school or less | 679 (23) |
| Some college | 938 (32) |
| 4-year college or more | 1,308 (44) |
| Annual household income | |
| <$50,000 | 1,347 (45) |
| $50,000–$74,999 | 676 (23) |
| ≥$75,000 | 849 (29) |
| Unknown | 80 (3) |
| Menopausal status | |
| Premenopause | 1,604 (54) |
| Early perimenopause | 1,348 (46) |
| BMI (kg/m2) | 27.8 ± 7.0 |
| Smoking status | |
| Never smoked | 1,709 (58) |
| Past only | 756 (26) |
| Current smoker | 487 (16) |
| Alcohol use | |
| None | 1,433 (49) |
| <1 serving per week | 324 (11) |
| 1–7 servings per week | 771 (26) |
| ≥7 servings per week | 421 (14) |
| Unknown | 3 (<1) |
| Physical activity score* | 7.7 ± 1.8 |
| Estradiol (pg/mL) | 55.2 (33.2, 88.5) |
| SHBG (nmol/L) | 41.6 (28.5, 58.0) |
| Total T (ng/dL) | 41.2 (29.5, 56.0) |
| Rate of change per year | |
| SHBG (nmol/L) | −0.2 (−1.5, 1.3) |
| T (ng/dL) | −0.3 (−1.7, 1.0) |
Data are presented as n (%), mean ± SD, or median (Q1, Q3).
Data are for N = 2,962 participants. *Physical activity score is the sum of three indices of sports and exercise, active living, and household/caregiving domains of physical activity. The values of the score range from 3 to 15.