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Table 2 Distribution of water inorganic arsenic concentrations

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

  Controls Controls excluding BCC 1 Cases
First trimester drinking water (μg/L)    
n 55 33 54
Mean ± SD 49.4 ± 103.6 38.3 ± 101.6 19.8 ± 54.6
Median 6.9 <LOD2 0.7
25th percentile <LOD <LOD <LOD
75th percentile 54.9 8.5 12.7
Lowest <LOD <LOD <LOD
Highest 506.0 450.0 357.0
  1. 1BCC = Birhampur Community Clinic.
  2. 2LOD = limit of detection (0.15 μg/L).