Table 1.
Characteristics of the exposure and outcomes variables.
| Variables | GM | GSD | Mean | SD | Median | Min | Max |
|---|---|---|---|---|---|---|---|
| Blood lead level in the 2nd trimester of pregnancy (μg/dL) | |||||||
| All subjects; N = 280 | 0.99 | 0.15 | 1.09 | 0.46 | 1.01 | 0.29 | 2.63 |
| Males; N = 130 * | 1.01 | 0.15 | 1.10 | 0.45 | 1.07 | 0.34 | 2.59 |
| Females; N = 150 | 0.97 | 0.16 | 1.07 | 0.47 | 0.98 | 0.29 | 2.63 |
| Cord blood lead level (μg/dL) | |||||||
| All subjects; N = 303 | 0.96 | 0.16 | 1.09 | 0.65 | 0.93 | 0.24 | 5.65 |
| Males; N = 155 ** | 0.99 | 0.16 | 1.11 | 0.59 | 0.94 | 0.29 | 4.04 |
| Females; N = 148 | 0.94 | 0.16 | 1.08 | 0.71 | 0.92 | 0.24 | 5.65 |
| Composite score for the one-year-old children; N = 367 | |||||||
| Cognitive | - | - | 106.9 | 10.3 | 105 | 80 | 145 |
| Language | - | - | 108.6 | 13.6 | 109 | 68 | 141 |
| Motor | - | - | 105.4 | 13.9 | 107 | 73 | 151 |
| Composite score for the two-year-old children; N = 233 | |||||||
| Cognitive | - | - | 112.6 | 16.3 | 110 | 80 | 145 |
| Language | - | - | 102.1 | 12.8 | 100 | 74 | 144 |
| Motor | - | - | 112.0 | 14.4 | 110 | 73 | 154 |
Comparison between males and females * t-test p = 0.56; ** t-test p = 0.68. GM—geometric mean. GSD—geometric standard deviation. SD—standard deviation.