Table 4 Menstrual cycle covariates 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
Covariates | 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 |
Continuous Variables | ||||||||
Mean Age (SD), years | 37.7 (6.9) | 36.8 (6.1) | 38.8 (6.9) | 0.07 (2) | 38.9 (6.4) | 37.1 (6.4) | 37.3 (7.2) | 0.07 (2) |
Mean BMI (SD), kg/m2 | 25.8 (5.4) | 26.9 (6.5) | 27.0 (6.8) | 0.28 (2) | 27.5 (6.4) | 26.3 (6.4) | 25.8 (5.9) | 0.12 (2) |
Amount of Weekly Exercise | ||||||||
Low No. (%) | 14 (12.5) | 17 (15.0) | 17 (15.2) | 0.27 (4) | 13 (11.7) | 15 (12.5) | 20 (18.9) | 0.27 (4) |
Moderate No. (%) | 38 (33.9) | 48 (42.5) | 51 (45.5) | Â | 41 (36.9) | 50 (41.7) | 46 (43.4) | Â |
High No. (%) | 60 (53.6) | 48 (42.5) | 44 (39.3) | Â | 57 (51.4) | 55 (45.8) | 40 (37.7) | Â |
Past Year History of Weight Loss = 10% | ||||||||
Without No. (%) | 95 (84.8) | 97 (85.8) | 101 (90.2) | 0.45 (2) | 97 (87.4) | 103 (85.8) | 93 (87.7) | 0.90 (2) |
With No. (%) | 17 (15.2) | 16 (14.2) | 11 (9.8) | Â | 14 (12.6) | 17 (14.2) | 13 (12.3) | Â |