Element

Town (n)

ADD

mg/Kg/day

HQ (mean min–max)

% HQ > 1 above

Confidence Interval (α = 0.95)

Arsenic

Bacanuchi (20)

1.91E−05

1.3 (0.3 - 2.8)

45

23 - 68.4

Arizpe (24)

6.25E−06*

0.4 (0.1 - 0.7)

0

-------

Aconchi (25)

1.33E−05

1.0 (0.2 - 4.0)

34

21.1 - 61.3

Baviácora (22)

1.98E−05

1.3 (0.4 - 2.9)

77

56.4 - 92.1

Ures (26)

1.63E−05

1.1 (0.3 - 2.9)

57

36.9 - 76.6

Total (117)

1.47E−05

1.0 (0.1 - 4.0)

42

34.4 - 53

Mercury

Bacanuchi (20)

1.34E−05*

2.7 (0.7 - 5.9)

80

56.3 - 94.2

Arizpe (24)

5.27E−06

1.0 (0.3 - 1.7)

58

36.6 - 77.8

Aconchi (25)

5.71E−06

1.3 (0.3 - 5.1)

64

42.5 - 82

Baviácora (22)

6.77E−06

1.3 (0.4 - 3.0)

77

54.6 - 92.1

Ures (26)

5.63E−06

1.1 (0.3 - 3.0)

57

36.9 - 76.6

Total (117)

7.06E−06

1.4 (0.3 - 5.9)

67

57.3 - 75.1