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) | ||||
|---|---|---|---|---|---|---|---|---|
| Â | Low (112) | Middle(113) | High (112) | Â | Low (111) | Middle (120) | High (106) | Â |
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) |