Table 2 Chromium in whole blood of the study population from Changhua, Taiwan (35–64 years).

From: Erratum: Biomonitoring of chromium for residents of areas with a high density of electroplating factories

 

N

n < MDL

10th

50th

90th

95th

Range

AM (SD)

GM (GSD)

CI GM

IFCC reference limit

B-Cr (μg/l)

641

35

0.16

0.38

0.714

0.79

0.067–6.47

0.441 (0.392)

0.357 (1.930)

0.34–0.38

<0.905

Years of age*

           

 35–44 years

205

5

0.198

0.415

0.76

0.905

0.067–6.47

0.498 (0.522)

0.405 (1.835)

0.37–0.44

<0.930

 45–54 years

213

15

0.15

0.38

0.713

0.778

0.067–2.60

0.425 (0.312)

0.342 (1.997)

0.31–0.38

<0.808

 55–64 years

223

15

0.157

0.35

0.694

0.75

0.067–3.71

0.403 (0.308)

0.330 (1.925)

0.30–0.36

<0.775

Area*

           

 High factory-density

521

27

0.17

0.405

0.73

0.815

0.067–6.47

0.470 (0.423)

0.379 (1.938)

0.36–0.40

<0.930

 Control

120

8

0.15

0.29

0.525

0.564

0.067–0.97

0.316 (0.161)

0.274 (1.771)

0.25–0.30

<0.614

  1. B-Cr=chromium in whole blood; N=sample size; MDL=method detection limit (0.133 μg/l for B-Cr); n< MDL=number of values below MDL (values below MDL were set to MDL/2); 10th, 50th, 90th, 95th=percentiles; AM=arithmetic mean; SD=standard deviation; GM=geometric mean; GSD=geometric standard deviation; CI GM=95%-confidence interval for GM.
  2. *Significant parameter (P<0.05).
  3. IFCC reference limit: nonparametric, 0.975 fractile is upper limit, 0.025 fractile is lower limit.
  4. If the lower limit is below MDL, only the upper limit is presented.
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