Table 1 Fluoride concentrations in drinking water in different regions in 2014 and 2018.

From: Non-carcinogenic health risks of fluoride exposure in minors based on national surveillance in China, 2014 and 2018

Region

2014

2018

Z

P

Median

Min

Max

Median

Min

Max

North China

1.08

0.11

5.95

0.87

0.15

5.51

− 2.252

0.024

East China

1.10

0.08

5.42

0.77

0.05

4.04

− 1.451

0.147

South China

0.22

0.11

3.21

0.20

0.14

0.40

− 1.298

0.194

Northwest China

0.69

0.03

11.8

0.48

0.10

5.94

− 3.772

 < 0.001

Northeast China

1.10

0.16

5.50

0.71

0.22

2.21

− 2.117

0.034

Southwest China

0.60

0.20

1.28

1.00

0.14

2.27

− 1.027

0.304

Total

0.84

0.03

11.8

0.59

0.05

5.94

− 3.870

 < 0.001

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