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Table 5 Cycle length by weight loss and PBB tertiles, Michigan Female Health Study, 1997–1998. Adjusted for PCB, BMI and age at interview, physical activity, smoking history, education, income.

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

 

Difference in Cycle Length, (days)

 

Without Weight Loss

With Weight Loss

 

No.

Diff

(95% CI)

No.

Diff

(95% CI)

Tertiles of PBB Estimated at Study Interview §

Low

95

0.00

Ref

17

-0.28

(-1.79 to 1.22)

Middle

97

0.35

(-0.48 to 1.18)

16

0.21

(-1.34 to 1.76)

High

101

0.30

(-0.53 to 1.13)

11

-1.04

(-2.86 to 0.77)

Test for Interaction: p = 0.57, 2 df

Tertiles of PBB Measured at Cohort Enrollment

      

Low

97

0.00

Ref

14

0.35

(-1.27 to 1.98)

Middle

103

0.01

(-0.80 to 0.82)

17

-1.02

(-2.53 to 0.48)

High

93

0.54

(-0.30 to 1.39)

13

-0.22

(-1.88 to 1.46)

Test for Interaction: p = 0.45, 2 df

  1. * Cycle lengths ranging from 20–35 days.