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Table 1 The number of samples in the study area

From: Association between heavy metals and colon cancer: an ecological study based on geographical information systems in North-Eastern Iran

County name

Number of rice milling factories

The area under cultivation (In acres)

Required sample size

Bandar gaz

6

2650

4

Kordku

8

6408

8

Bandar torkeman

4

515

4

Agh ghala

6

4543

6

Gorgan

18

5209

7

Ali Abad

7

6200

6

Azadshahr

12

5275

7

Gonbad

8

6530

8

Ramian

6

1819

4

Minoodasht

11

4985

7

Kalaleh

4

970

4

Total

90

45,714

69