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Table 3 Results from weighted logistic regression models with the outcome neural tube defects (n = 112)

From: Arsenic is associated with reduced effect of folic acid in myelomeningocele prevention: a case control study in Bangladesh

Variable Main effects model Interaction model
  β OR (95% CI) 1 pValue β OR (95% CI) 1 p Value
Ln-water As 0.0278 1.03 (0.96, 1.11) 0.45 −0.3190 - -
Periconceptional folic acid use2 −1.2029 0.300 (0.19, 0.47) <0.0001 1.7280 - -
Home birth3 0.9224 2.51 (1.61, 3.92) <0.0001 1.0047 2.73 (1.72, 4.32) <0.0001
Mother’s age in years 0.1649 1.18 (1.10, 1.26) <0.0001 0.1573 1.17 (1.09, 1.26) <0.0001
Father’s age in years −0.0607 0.94 (0.89, 1.00) 0.05 −0.0416 0.96 (0.90, 1.01) 0.17
Child sex4 0.9152 2.50 (1.56, 3.99) 0.0001 0.7986 2.22 (1.38, 3.59) 0.001
Child age in months −0.1305 0.88 (0.84, 0.92) <0.0001 −0.1337 0.88 (0.94, 0.91) <0.0001
Ln-water As*prenatal folic acid use     0.4636 - <0.0001
  1. 1OR indicates odds of being a CASE.
  2. 2Reported use = 1, No reported use = 0.
  3. 3Home birth = 1, Clinic or Hospital birth = 0.
  4. 4Male = 1, Female = 0.