Table 3 Odds ratios (95% CI) of uterine fibroids across tertiles of pb, cd, and hg, NHANES 1999–2006

Blood Pb, (µmol/l)

 Q1

ref

ref

ref

 Q2

1.91(1.44,2.53) ^*

1.96(1.46,2.62) ^*

1.33(0.97,1.82)

 Q3

1.97(1.56,2.48) ^*

2.09(1.64,2.67) ^*

1.13(0.86,1.47)

 P for trend

< 0.0001

< 0.0001

0.71

Blood Cd, (nmol/l)

 Q1

ref

ref

ref

 Q2

1.64(1.19,2.28) ^*

1.67(1.20,2.31) ^*

1.33(0.94,1.88)

 Q3

1.71(1.28,2.28) ^*

1.99(1.43,2.77) ^*

1.26(0.86,1.84)

 P for trend

< 0.001

< 0.001

0.32

Blood Hg, (µmol/l)

 Q1

ref

ref

ref

 Q2

1.66(1.13,2.46) ^*

1.68(1.13,2.51) ^*

1.27(0.86,1.87) ^*

 Q3

1.98(1.49,2.64) ^*

2.15(1.62,2.85) ^*

1.41(1.06,1.89) ^*

 P for trend

< 0.0001

< 0.0001

0.03