Table 1 Sample characteristics
From: A cross-sectional study of well water arsenic and child IQ in Maine schoolchildren
Measures | Mean ± SD or %(n) |
|---|---|
Child characteristics | Â |
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 | Â |
RSU-A | 28.68% (78) |
RSU-B | 18.75% (51) |
RSU-C | 52.57% (143) |
Race % White | 95.2 (259) |
Family characteristics | Â |
Paternal age (N = 267) | 43.64 ± 6.66 |
Paternal education | Â |
≤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 | Â |
≤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 | Â |
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 | Â |
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 | Â |
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 |