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Table 3 Menstrual cycle outcomes by PBB tertiles from two time frames, Michigan Female Health Study, 1997–1998.

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

Outcomes Tertiles of PBB Estimated at Study Interview (No.) P * (df) Tertiles of PBB Measured at Cohort Enrollment (No.) P * (df)
  Low (112) Middle(113) High (112)   Low (111) Middle (120) High (106)  
Mean Cycle Length (SD), days 27.4 (3.1) 28.0 (2.9) 27.7 (2.8) 0.33 (2) 27.5 (3.0) 27.6 (2.8) 28.0 (3.0) 0.34 (2)
Mean Bleed Length (SD), days 5.0 (1.3) 5.1 (1.3) 5.2 (1.3) 0.36 (2) 4.9 (1.3) 5.1 (1.3) 5.3 (1.3) 0.14 (2)
  1. * ANOVA F test for continuous variables. Exponentiated from log(bleed length).