High-carbon

Low-carbon

Undocumented

(n = 86)

(n = 16)

(n = 1)

Mean Cobalt Level [μg/l]^a

2.55

3.11

2.04

SD [μg/l]

±

7.37

2.57

95% Confidence

Lower Bound

0.97

1.84

Interval [μg/l]^b

Upper Bound

4.13

4.37

Range [μg/l]

min.

0.2

0.44

max.

66.8

7.66

Mean Chromium Level [μg/l]^a

1.58

2.17

1.18

SD [μg/l]

±

4.47

1.6

95% Confidence

Lower Bound

0.62

1.32

Interval [μg/l]^b

Upper Bound

2.53

3.02

Range [μg/l]

min.

0.2

0.55

max.

41.6

4.9

Mean Molybdenum Level [μg/l]^a

0.6

0.5

0.43

SD [μg/l]

±

0.33

0.16

95% Confidence

Lower Bound

0.53

0.41

Interval [μg/l]^b

Upper Bound

0.67

0.58

Range [μg/l]

min.

0.2

0.24

max.

2.56

0.66