Skip to main content

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%)
  1. * Cycle lengths ranging from 20–35 days. 44 missing PCB levels.