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Table 2 Cross tabulation of PBB tertiles from two timeframes, Michigan Female Health Study, 1997–1998.

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

No. in Tertiles of PBB Exposure Measured at Cohort Enrollment, (Range, ppb) No. in Tertiles of PBB Exposure Estimated at Time of Study Interview (Range, ppb) Total No.
  Low (0.00–0.06) Middle (>0.06–0.32) High (>0.32)  
Low (≤ 1.0) 84 27 0 111
Middle (1.0–3.0) 23 69 28 120
High (>3.0) 5 17 84 106
Total No. 112 113 112 337