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Table 5 Cycle 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

  Difference in Cycle Length, (days)
  Without Weight Loss With Weight Loss
  No. Diff (95% CI) No. Diff (95% CI)
Tertiles of PBB Estimated at Study Interview §
Low 95 0.00 Ref 17 -0.28 (-1.79 to 1.22)
Middle 97 0.35 (-0.48 to 1.18) 16 0.21 (-1.34 to 1.76)
High 101 0.30 (-0.53 to 1.13) 11 -1.04 (-2.86 to 0.77)
Test for Interaction: p = 0.57, 2 df
Tertiles of PBB Measured at Cohort Enrollment       
Low 97 0.00 Ref 14 0.35 (-1.27 to 1.98)
Middle 103 0.01 (-0.80 to 0.82) 17 -1.02 (-2.53 to 0.48)
High 93 0.54 (-0.30 to 1.39) 13 -0.22 (-1.88 to 1.46)
Test for Interaction: p = 0.45, 2 df
  1. * Cycle lengths ranging from 20–35 days.