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Table 6 Bleed length by weight loss and PBB tertiles, Michigan Female Health Study, 1997–1998. Adjusted for PCB, BMI and age at interview, physical activity, smoking history, education, income.

From: Menstrual function among women exposed to polybrominated biphenyls: A follow-up prevalence study

  Ratio of Bleed Length *
  Without Weight Loss With Weight Loss
  No. Ratio (95% CI) No. Ratio (95% CI)
Tertiles of PBB Estimated at Study Interview §
Low 95 1.00 Ref 17 0.82 (0.72 to 0.93)
Middle 97 0.92 (0.85 to 1.01) 16 0.92 (0.80 to 1.06)
High 101 1.00 (0.91 to 1.09) 11 1.27 (1.08 to 1.50)
Test for Interaction: p < 0.0001, 2 df
Tertiles of PBB Measured at Cohort Enrollment
Low 97 1.00 Ref 14 0.89 (0.78 to 1.03)
Middle 103 1.03 (0.96 to 1.10) 17 0.98 (0.86 to 1.12)
High 93 1.03 (0.96 to 1.11) 13 1.16 (1.00 to 1.34)
Test for Interaction: p = 0.08, 2 df
  1. * Exponentiated from difference in log(bleed length).