Table 7 Multi-variable analyses of methemoglobin levels and covariates among women who reported drinking tap water at 36 weeks gestation (n = 214)

Intercept

-1.512

0.439

0.001

Copper level (mg/L)

-0.299

1.172

0.799

Sulfate level (mg/L)

-0.0002

0.001

0.851

Age (years)

0.013

0.048

0.814

Race (White)

-0.858

1.608

0.601

Nitrate from water (mg/Kg/day)

0.046

2.564

0.986

Bacteria in water (yes)

0.361

0.526

0.493

Vegetable 24 hrs (yes)

-0.621

0.345

0.074

Water source (private well)

0.109

0.333

0.742

Carboxyhemoglobin

0.245

0.113

0.032

Cured meats (yes)

0.226

0.295

0.445

Vitamins (no)

-0.083

0.418

0.844