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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