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Table 1 Distribution of arsenic exposure levels in well water

From: Age adjustment in ecological studies: using a study on arsenic ingestion and bladder cancer as an example

  Arsenic level (mg/L)
  < 0.04 0.05-0.08 0.09-0.16 0.17-0.32 0.33-0.64 > 0.64
Average % of wells in each township 91.0 2.8 3.0 1.7 1.0 0.6
Estimated populationa       
Males 5 605 000 169 000 159 000 84 000 47 000 25 000
Females 5 144 000 156 000 147 000 77 000 43 000 23 000
Total 10 749 000 326 000 305 000 162 000 90 000 48 000
  1. around-off to 1000; estimated total study population: 11 678 000.