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Table 5 Associations between heavy metal levels as categorical variable and volume of uterine fibroids

From: Blood cadmium and volume of uterine fibroids in premenopausal women

  Quartile The largest volume (cm3)
Unadjusted   Adjusteda
β 95% CI P β 95% CI P
Cadmium (μg/L) 1 (<0.9) Ref.    Ref.   
2 (0.9-1.0) −0.91 −2.74-0.91 0.317 −0.47 −3.16-2.22 0.722
3 (1.0-1.2) −0.77 −2.60-1.05 0.396 −0.48 −3.12-2.16 0.713
4 (1.2-3.1) 0.51 −1.32-2.34 0.575 1.19 −1.52-3.90 0.376
Lead (μg/dL) 1 (<1.1) Ref.    Ref.   
2 (1.1-1.3) −0.39 −2.21-1.43 0.667 −0.42 −2.69-1.85 0.707
3 (1.3-1.8) 0.85 −0.98-2.67 0.353 0.85 −1.67-3.37 0.496
4 (1.8-3.2) −0.77 −2.59-1.05 0.395 −1.23 −3.74-1.29 0.326
Mercury (μg/L) 1 (<1.2) Ref.    Ref.   
2 (1.2-1.7) −0.54 −2.44-1.36 0.567 −0.23 −2.80-2.34 0.856
3 (1.7-2.7) −0.59 −2.48-1.31 0.535 −1.03 −3.58-1.52 0.415
4 (2.7-4.7) −0.40 −2.3-1.49 0.668 −0.65 −3.15-1.85 0.597
  1. aβ coefficients adjusted for age, BMI, gravidity, oral contraceptive pill administration history, regularity of menstrual cycle, hemoglobin level, and serum cotinine levels