Skip to main content

Table 2 Predicting child IQ from Water As measured from the kitchen tap

From: A cross-sectional study of well water arsenic and child IQ in Maine schoolchildren

Contributors Full scale B ± se Working memory B ± se Perceptual reasoning B ± se Verbal comprehension B ± se Processing speed B ± se
Model 1: Without adjustment
Water As < 5 μg/L      
10 > WAs ≥5 μg/L −6.96 ± 2.10** −5.24 ± 2.26* −5.94 ± 2.21** −7.54 ± 2.65** −1.34 ± 2.08
20 > WAs ≥ 10 μg/L −4.57 ± 2.00* −2.54 ± 2.16 −6.68 ± 2.11** −3.40 ± 2.53 −0.61 ± 1.99
WAs ≥ 20 μg/L −4.63 ± 2.39# −6.47 ± 2.57* −3.97 ± 2.51 −3.49 ± 3.02 0.06 ± 2.37
R2 5.03% 3.50% 5.02% 3.14% 0.18%
Model 2: Adjusting for other features
Water As < 5 μg/L      
10 > WAs ≥5 μg/L −6.09 ± 1.98** −4.88 ± 2.24* −4.97 ± 2.14* −6.22 ± 2.49* −1.74 ± 2.09
20 > WAs ≥ 10 μg/L −3.15 ± 1.91 −1.13 ± 2.16 −5.10 ± 2.06* −1.86 ± 2.39 −1.15 ± 2.01
WAs ≥ 20 μg/L −2.51 ± 2.29 −5.07 ± 2.59# −2.29 ± 2.47 −0.82 ± 2.88 0.40 ± 2.42
Number of other children in home −0.17 ± 0.79 0.84 ± 0.89 0.36 ± 0.85 −0.72 ± 0.99 −0.84 ± 0.83
Maternal IQ 0.27 ± 0.07*** 0.23 ± 0.08** 0.25 ± 0.08*** 0.32 ± 0.09*** −0.04 ± 0.07
Maternal Ed (> HS) 4.35 ± 1.62** 0.32 ± 1.84 1.42 ± 1.75 7.62 ± 2.04*** 3.14 ± 1.72#
HOME      
Missing 6+ items −5.16 ± 2.54* −3.34 ± 2.87 −7.44 ± 2.74** −3.96 ± 3.19 −0.70 ± 2.68
Low scores −1.96 ± 1.58 −2.21 ± 1.79 −2.45 ± 1.71 0.22 ± 1.99 −1.95 ± 1.67
School district (compared to “C”)      
District “A” −1.70 ± 1.71 0.47 ± 1.94 0.22 ± 1.84 −3.26 + 2.15 −3.71 + 1.80*
District “B” 1.20 ± 1.97 −0.67 ± 2.24 1.44 ± 2.13 3.15 + 2.48 −2.27 + 2.08
R2 19.60% 9.46% 15.37% 19.06% 4.49%
WAs∆R2 3.18% 2.48% 2.98% 1.97% 0.37%
  1. *p < .05; **p < .01; ***p < .001; ****p < .0001 ; #p < .10.