Table 2.

Mean concentrations and proportions of arsenic species in each urine sample collected from each study subject

MeasureSample 1 (n = 81)
Sample 2 (n = 81)
Sample 3 (n = 62)
Mean*MeanRangeMean*MeanRangeMean*MeanRange
Time (d)NANANA1391-61258257114-739
InAs (μg/L)3.11.80.1-19.83.41.80.1-21.34.32.00.1-37.4
MMA (μg/L)3.11.80.1-20.93.82.00.2-19.43.82.20.4-29.9
DMA (μg/L)18.411.51.0-78.721.311.80.4-194.822.112.91.3-126.7
Tot-As (μg/L)24.615.71.3-110.828.616.11.3-234.030.217.82.2-184.4
Adjusted Tot-As§40.218.22.1-301.631.320.12.9-275.336.622.84.1-159.8
%InAs12.911.63.0-36.412.611.21.6-38.513.211.13.9-66.1
%MMA12.511.72.5-27.513.612.52.1-38.313.112.13.9-24.7
%DMA74.574.050.0-87.873.873.030.8-90.373.872.728.8-89.9
MMA/DMA0.180.160.03-0.550.200.170.02-1.000.180.170.04-0.45
  • NOTE: Abbreviations: InAs, inorganic arsenic; MMA, monomethylarsonate; DMA, dimethylarsinate.

  • * Arithmetic mean.

  • Geometric mean.

  • No. days between samples 1 and 2 and between samples 1 and 3.

  • § Total As in μg/L divided by creatinine concentration in g/ml.