Table 2.
Study population characteristics for participants at Entry (baseline) and in Year 2 and Year 7
| Characteristic | BOYS | GIRLS | ||||
|---|---|---|---|---|---|---|
| ENTRY | YEAR 2 | YEAR 7 | ENTRY | YEAR 2 | YEAR 7 | |
| Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | |
| Age | 10.15 (.84) | 12.20 (.84) | 17.14 (.86) | 10.10 (.92) | 12.16 (.95)) | 17.08 (1.02) |
| School Year | 4.04 (1.05) | 5.78 (1.2) | 9.40 (2.04) | 4.15 (1.07) | 5.92 (1.16) | 9.86 (1.52)) |
| Non-Verbal IQ (at entry only) | 86.26 (10.37) | --- | --- | 86.26 (10.37) | --- | --- |
| Urinary Mercury Concentrations | ||||||
| Raw HgUa Range Calculated Ln HgUb Range Calculated Maximumb Range Calculated Cumulativec Range |
1.65 (1.25) (0.14, 7.61) 0.89 (0.41) (0.13, 2.15) --- --- |
2.17 (2.02) (0.05/11.5) 1.02 (0.49) (0.04/2.53) --- --- |
1.25 (3.00) (.005, 31.7) 0.62 (0.48) (0.00, 3.49) 1.46 (0.52) (1.32, 4.03) 2.47 (0.50) (0.53, 3.49) |
1.98 (2.40) (0.11, 23.5) 0.94 (0.48) (0.10, 3.20) --- --- |
2.86 (2.63) (.007, 15.6) 1.18 (0.57) (0.01, 2.81) --- --- |
1.77 (2.27) (.006, 15.3) 0.83 (0.56) (0.01, 2.79) 1.68 (0.54) (1.44, 4.13) 2.74 (0.55) (0.61, 3.20) |
| Distribution | % (N) | % (N) | % (N) | % (N) | % (N) | % (N) |
| Total Subjects (N) | 164 | 160 | 121 | 166 | 151 | 118 |
| Caucasian - % (N) | 74.4% (122) | 74.4% (119) | 71.9% (87) | 71.1% (118) | 68.9% (104) | 69.5% (82) |
| CPOX4 Wildtype (A/A) Heterozygous (A/C) Homozygous Mutant (C/C) |
71.3% (117) 28.0% (46) 0.6% (1) |
71.3% (114) 28.1% (45) 0.6% (1) |
67.8% (82) 31.4% (38) 0.8% (1) |
65.1% (108) 27.7% (46) 7.2% (12) |
64.2% (97) 27.8% (42) 7.9% (12) |
61.9% (73) 28.8% (34) 9.3% (11) |
| CPOX5 Wildtype (A/A) Heterozygous (A/C) Homozygous Mutant (C/C) |
54.3% (89) 37.8% (62) 7.9% (13) |
53.8% (86) 38.1% (61) 8.1% (13) |
54.2% (65) 38.3% (46) 7.5% (9) |
61.7% (103) 32.9% (55) 5.4% (9) |
62.5% (95) 32.9% (50) 4.6% (7) |
64.7% (77) 31.1% (37) 4.2% (5) |
a
µg/g creatinine;
b
ln(µg/g creatinine+1);
c
ln[(Σµg/g creatinine) +1]