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Table 2 Risk of low birth weight associated with levels of manganese in maternal urine

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

Manganese (μg/g creatinine) Cases Controls ORa (95 % CI) ORb (95 % CI)
Total (n = 816)     
  < 0.30 55 204 1.11 (0.71, 1.74) 1.28 (0.67, 2.45)
 0.30–1.16 48 204 1.00 1.00
  ≥ 1.16 101 204 2.19 (1.46, 3.27) 2.04 (1.12, 3.72)
  1. Abbreviation: OR odds ratio; CI confidential interval
  2. a Unadjusted odds ratio
  3. b Adjusted for gestational age, household income, pre-pregnancy body mass index, parity, passive smoking, gestational hypertension