Table 1.
Characteristics of participants in the Study of Women’s Health Across the Nation (SWAN) 1999–2011.
| SWAN visit | V03 | V06 | V09 | V12 |
|---|---|---|---|---|
| Year of sample collection | 1999–2000 | 2002–2003 | 2005–2006 | 2009–2011 |
| No. of participants | 75 | 75 | 75 | 75 |
| Age at interview1, years | 49.4 (47.1–51.2) | 52.5 (50.1–54.2) | 55.4 (53.2–57.3) | 59.6 (57.8–62.1) |
| Body mass index1, kg/m2 | 26.1 (22.7–32.0) | |||
| Study site | ||||
| Southeast Michigan | 19 (25.3%) | |||
| Boston, MA | 23 (30.7%) | |||
| Oakland, CA | 33 (44.0%) | |||
| Race/ethnicity | ||||
| Black | 19 (25.3%) | |||
| White | 37 (49.3%) | |||
| Chinese | 19 (25.3%) | |||
| Menstrual bleeding since last visit | 67 (89.3%) | 46 (61.3%) | 23 (30.7%) | 3 (4.0%) |
| Parity | ||||
| Nulliparous | 12 (16.0%) | |||
| Parous | 63 (84.0%) | |||
1
Median (interquartile range).