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Table 4 Proportion of different arsenic species (DMA, MMA, AsIII, and AsV) and methylation indices in urine and saliva samples

From: Total arsenic and speciation analysis of saliva and urine samples from individuals living in a chronic arsenicosis area in China

 

Proportion (%)

Methylation indices

DMA

MMA

AsIII

AsV

PMIa

SMIb

Urine Samples

 Mean

54.38

23.14

8.98

12.67

0.78**

0.7*

 Std. Deviation

1.02

0.32

0.40

0.69

0.01

0.01

 Percentiles

  25

50.40

22.09

7.47

11.05

0.74

0.68

  50

55.21

23.35

9.11

12.46

0.78

0.71

  75

57.60

24.29

10.39

15.22

0.8

0.72

Saliva Samples

 Mean

13.08

9.13

48.22

27.97

0.22

0.55

 Std. Deviation

1.41

1.12

5.43

3.17

0.02

0.05

 Percentiles

  25

6.01

6.35

30.81

11.79

0.06

0.51

  50

15.78

9.16

33.85

33.78

0.25

0.6

  75

17.38

14.08

86.79

39.75

0.32

0.67

  1. aPrimary methylation index (PMI) calculated from (MMA + DMA)/total As (TAs), bSecondary methylation index (SMI) calculated from DMA/(MMA + DMA) [33]
  2. * p < 0.05, ** p < 0.01, compared with mean value in saliva samples by Student’s t-test
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Environmental Health and Preventive Medicine

ISSN: 1347-4715

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