Table 1 Characteristics of 337 women,* Michigan Female Health Study, 1997–1998.
From: Menstrual function among women exposed to polybrominated biphenyls: A follow-up prevalence study
| Population Characteristics | Distribution | |
|---|---|---|
| Continuous Variables | Point Estimate (Range) | |
| Median PBB level (ppb) measured at cohort enrollment | 2.0 (0.5–1490) | |
| Median PBB level (ppb) estimated at study interview | 0.1 (0–1005) | |
| Median initial PCB level (ppb) measured in cohort follow-up | 5.0 (1.5–78) † | |
| Mean age (years) at study interview | 37.8 (24–56) | |
| Mean BMI (kg/m2) at study interview | 26.6 (16.9–53.1) | |
| Categorical Variables | N (%) | |
| Past Year History of Weight Loss = 10% | No | 293(86.9%) |
| Yes | 44 (13.0%) | |
| Amount of weekly exercise | Low (Never) | 48 (14.2%) |
| Moderate (1 or 2 times) | 137 (40.6%) | |
| High (3 or more times) | 152 (45.1%) | |
| Lifetime smoking status | Never Smoker | 222 (65.9%) |
| Ever Smoker | 115 (34.1%) | |
| Educational attainment | High School Grad or Less | 132 (39.2%) |
| Some College or Technical | 110 (32.6%) | |
| College or Postgrad | 95 (28.2%) | |
| Annual Household Income | Less Than $35,000 | 113 (33.5%) |
| At Least $35,000 | 207 (61.4%) | |
| Unknown | 17 (5.0%) | |