Table 1 Median water iodine content (μg/L) in water from coastal and inland, urban and rural, and former goitrous and non-goitrous areas in ground water, surface water, and all water samples from 166 municipality water treatment plants

All

166

4.0

4.0

3.5

(0–27)

(0–27)

(0–11)

Coastal

56

4.1

4.0

4.5

(0–22)

(0–22)

(0–11)

Inland

110

3.5

4.0

3.0

(0–27)

(0–27)

(0–13)

Urban

20

4.3

1.3*

4.5

(0–11)

(0–11)

(0–9)

Rural

146

3.8

4.0*

3.0

(0–27)

(0–27)

(0–27)

Goitrous

31

2.0***

2.6**

1.8***

(0–22)

(0–22)

(0–8)

Non-goitrous

52

4.3***

6.0**

4.0***

(0–27)

(0–27)

(0–11)