Table 1.
Sample characteristics
| Measures | Mean ± SD or %(n) |
|---|---|
| Child characteristics |
|
| Male % |
53.31 (145) |
| Child age |
9.67 ± 1.18 |
| Length of current residence |
7.34 ± 2.37 |
| School Grade |
3.80 ± 0.81 |
| School District |
|
| RSU-A |
28.68% (78) |
| RSU-B |
18.75% (51) |
| RSU-C |
52.57% (143) |
| Race % White |
95.2 (259) |
| Family characteristics |
|
| Paternal age (N = 267) |
43.64 ± 6.66 |
| Paternal education |
|
| ≤High school graduate |
29.04% (79) |
| Some college |
26.84% (73) |
| College graduate |
22.43% (61) |
| Graduate |
19.85% (54) |
| Any post-graduate |
1.84% (5) |
| Maternal age |
40.72 ± 6.02 |
| Maternal education |
|
| ≤High school graduate |
13.60% (37) |
| Some college |
34.93% (95) |
| College graduate |
32.35% (88) |
| Any post-graduate |
19.12% (52) |
| Maternal IQ (WASI) |
114.84 ± 11.31 |
| HOME Total (n = 243) |
52.57 ± 3.73 |
| HOME category |
|
| Missing |
10.66 ± 29 |
| Low scores (<53) |
40.81 ± 111 |
| High scores (≥53) |
48.53 ± 132 |
| Number of other children in home |
1.29 ± 0.91 |
| Exposure characteristics |
|
| Overall well water As (μg/L) |
9.88 ± 15.06 |
| Water As < 5 μg/L
(n = 141) |
1.24 ± 1.37 |
| 10 > WAs >5 μg/L
(n = 46) |
7.37 ± 1.34 |
| 20 > WAs > 10 μg/L
(n = 52) |
14.80 ± 3.06 |
| WAs > 20 μg/L (n = 33) |
42.55 ± 20.43 |
| % Well water As ≥ 10 μg/L |
31.25 (85) |
| Nail As (μg/g) |
4.65 ± 4.60 |
| Child Intelligence |
|
| Full Scale |
110.32 ± 12.60 |
| Verbal Comprehension |
114.26 ± 15.78 |
| Perceptual Reasoning |
108.57 ± 13.25 |
| Working Memory |
102.72 ± 12.20 |
| Processing Speed | 103.34 ± 13.44 |