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Table 4 Risk of low birth weight associated with maternal urinary manganese levels, stratified by infant sex

From: Maternal urinary manganese and risk of low birth weight: a case–control study

Manganese levelsa

Male (n = 404)

Female (n = 412)

P for heterogeneity

Ca/Co

ORb (95 % CI)

ORc (95 % CI)

Ca/Co

ORb (95 % CI)

ORc (95 % CI)

Tertile 1

22/101

0.73 (0.38, 1.40)

0.64 (0.22, 1.83)

32/103

1.55 (0.81, 2.98)

2.12 (0.86, 5.25)

0.24

Tertile 2

29/101

1.00

1.00

20/103

1.00

1.00

 

Tertile 3

50/101

1.77 (1.02, 3.06)

1.88 (0.85, 4.79)

51/103

2.65 (1.46, 4.80)

1.94 (0.88, 4.45)

 
  1. Abbreviations: ca/co, numbers of cases and controls; CI confidence interval; OR odds ratio
  2. a Manganese levels (μg/g creatinine): male, tertile1 (<0.31), tertile 2 (0.31–1.24), tertile 3 (≥1.25); female, tertile 1 (<0.28), tertile 2 (0.28–1.04), tertile 3(≥1.05)
  3. b Crude odds ratio
  4. c Adjusted for gestational age, household income, pre-pregnancy body mass index, parity, passive smoking, and gestational hypertension