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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