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Table 4 Multiple linear regression in metals levels and relevant variables of infertile women (N = 310)

From: Relationship between risk factors for infertility in women and lead, cadmium, and arsenic blood levels: a cross-sectional study from Taiwan

Variables

Blood Pb

Blood Cd

Blood As

β

p value

β

p value

β

p value

Age (years old)

0.00

0.28

0.01

0.14

0.00

0.65

Education levela

−0.02

0.69

0.06

0.21

−0.03

0.53

Occupational exposureb

0.01

0.79

−0.01

0.85

0.02

0.57

Family incomec

0.02

0.45

0.01

0.85

−0.05*

0.04*

BMI (kg/m2)

0.00

0.96

−0.01

0.24

−0.00

0.74

Menstruationd

−0.03

0.31

−0.06

0.05*

−0.03

0.26

Fish consumptione

0.01

0.63

−0.02

0.31

0.03

0.09

Chinese herbal medicine usef

0.04

0.02*

−0.01

0.49

0.02

0.06

Alcohol consumptiong

0.00

0.95

0.03

0.29

−0.02

0.50

Smokingh

0.11

0.06

−0.06

0.29

0.03

0.51

Physical activityi

−0.03

0.24

−0.03

0.12

−0.00

0.91

  1. * p < 0.05
  2. aEducation levels were dichotomized as ≤ Senior high school and University or above
  3. bHad worked in metal exposure places at least one month or not
  4. cFamily income was dichotomized at US$3,500 per month
  5. dMenstruation was dichotomized as regular and irregular. Regular: 24–35 day menstrual cycles; irregular: menstrual cycle <8 time/year or >35 days
  6. eFish consumption was categorized in 3 frequencies as never, ≤1 meal/week, and >1 meal/week
  7. fChinese herbal medicine use was categorized in 3 frequencies as no (<1/month), 1–3 times/month, and 1–6 times/week
  8. gAlcohol consumption was dichotomized as yes and no. Yes defined as drinking wines as usual
  9. hSmoking was dichotomized as yes and no. Yes: current smokers; No: never-smokers and ex-smokers
  10. iPhysical activity was categorized in 3 frequencies as no, 1-2/week, and ≥3/week