Table 5.

Mean difference in proportions of plasma arsenicals associated with drinking water iAs

	Mean Difference (95% CI) in Plasma Arsenicals
	%P-iAs	%P-MMAs	%P-DMAs
Drinking Water iAs1	−3.6% (−5.1, −2.1)	1.2% (0.4, 2.0)	2.4% (1.2, 3.7)
Sex
Males	0.0% (ref)	0.0% (ref)	0.0% (ref)
Females	4.7% (0.9, 8.5)	−1.9% (−3.9, 0.1)	−2.8% (−6.1, 0.5)
Age
< 18	0.0% (ref)	0.0% (ref)	0.0% (ref)
18 – 35	−1.0% (−6.3, 4.4)	0.5% (−2.4, 3.3)	0.6% (−4.0, 5.2)
35 – 55	−2.2% (−7.8, 3.3)	−2.3% (−5.2, 0.6)	4.5% (−0.2, 9.2)
≥ 55	−6.4% (−12.9, 0.1)	−0.5% (−3.9, 2.9)	6.9% (1.8, 12.4)
BMI
Underweight	0.0% (ref)	0.0% (ref)	0.0% (ref)
Normal	−2.1% (−8.0, 3.7)	3.0% (−0.2, 6.1)	−0.8% (−5.9, 4.2)
Overweight	−5.1% (−12.0, 1.8)	4.0% (0.4, 7.7)	1.0% (−4.9, 7.0)
Obese	−3.5% (−10.5, 3.5)	1.5% (−2.2, 5.2)	2.0% (−4.0, 8.0)
Smoking
No	0.0% (ref)	0.0% (ref)	0.0% (ref)
Yes	−2.5% (−8.3, 3.4)	−1.9% (−5.0, 1.2)	4.4% (−0.6, 9.4)
Seafood Consumption
No	0.0% (ref)	0.0% (ref)	0.0% (ref)
Yes	−4.5% (−9.8, 0.9)	0.7% (−2.2, 3.5)	3.8% (−0.8, 8.4)

¹percent change in plasma arsenicals associated with a doubling of the concentration of drinking water iAs.