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Table 3 Change in percentages of urinary arsenic metabolites and other arsenic biomarkers between two visitsa

From: Determinants of arsenic methylation efficiency and urinary arsenic level in pregnant women in Bangladesh

  Sirajdikhan    Pabna    All mothers   
Median change Mean p-valuea Median change Mean p-value Median change Mean p-value
(5th–95th percentile) change (5th–95th percentile) change (5th–95th percentile) change
iAsIII%b 0 (−10.6, 8.5) −0.7 < 0.01 − 0.1 (− 15.7, 9) −2.6 < 0.01 0 (− 13.9, 8.7) − 1.6 < 0.01
iAsV% 0 (− 13.8, 18.3) 0.8 0.09 0 (−14.2, 13.8) 0.2 0.38 0 (− 14.2, 16.6) 0.5 0.56
iAs% 0 (−16.3, 17.6) 0.1 0.27 −2.7 (−15.9, 12.3) −2.5 < 0.01 −1.4 (− 16.2, 15.1) −1.1 < 0.01
MMA% 0.4 (−9.1, 9) 0.5 < 0.01 −0.3 (−8, 5.7) − 0.6 < 0.01 0.1 (− 8.6, 7.3) 0 0.91
DMA% −0.2 (−22.7, 21) − 0.6 0.52 3.3 (−12.2, 20.6) 3.1 < 0.01 1.8 (−19.7, 20.8) 1.1 < 0.01
log (unadjusted U-As)c 0.6 (−1.8, 2.8) 0.5 <  0.01 −0.1 (−2.2, 2) − 0.1 0.03 0.3 (−2, 2.5) 0.2 < 0.01
log(U-creatinine) 0.3 (−1.7, 2.1) 0.3 <  0.01 −0.2 (−2.1, 1.5) − 0.3 <  0.01 0.1 (− 1.9, 1.9) 0.1 0.07
log (adjusted U-As) 0.6 (−1.8, 2.8) 0.5 < 0.01 −0.1 (−2.2, 2) − 0.1 < 0.01 0.3 (− 2, 2.5) 0.2 < 0.01
log (DW-As)d 0 (−3.5, 2.5) 0 0.89 0 (−1.3, 2) 0.2 < 0.01 0 (−2.7, 2.5) 0.1 0.05
log(T-As) −0.4 (−1.8, 1.1) − 0.4 < 0.01 − 0.3 (− 1.1, 0.7) −0.3 < 0.01 − 0.4 (− 1.5, 0.8) −0.4 < 0.01
  1. a The units of iAsIII%, iAsV%, iAs%, MMA% and DMA% are all “%”. The unit of unadjusted U-As, U-creatinine, adjusted U-As, DW-As and T-As are μg/L, mg/dL, μg/g-creatinine, μg/L and μg/g, respectively
  2. b Wilcoxon signed rank test p-values for the first five variables, conditional on Sirajdikhan site (N = 782), Pabna site (N = 661), and all mothers (N = 1443)
  3. c Paired t-tests of differences between visit 1 and visit 2, conditional on Sirajdikhan site (N = 782), Pabna site (N = 661), and all mothers (N = 1443)
  4. d Paired t-tests of differences between visit 1 and one-month post-partum, conditional on Sirajdikhan site (N = 577), Pabna site (N = 573), and all mothers (N = 1150)