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Table 6 Distribution of methemoglobin levels at 36 weeks follow up by tap water nitrate levels (n = 304)

From: Nitrates in drinking water and methemoglobin levels in pregnancy: a longitudinal study

 

Methemoglobin (%)

Nitrate (mg/L)

Mean ± SD

Median

Range

p-value a

≤3 (n = 264)

0.46 ± 0.49

0.35

0.1-1.4

p = 0.74

>3≤ 10 (n = 38)

0.52 ± 0.46

0.50

0.1-2.2

 

>10 (n = 4)

0.45 ± 0.33

0.50

0.1-0.8

 
  1. a p-value comparing mean methemoglobin levels by nitrate subgroups
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Environmental Health

ISSN: 1476-069X