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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.