Research Article
Developmental Effects of Exposures to Environmental Factors: The Polish Mother and Child Cohort Study
Table 2
Characteristics of the exposure and outcome variables.
| | Variables | Geometric mean | Mean | SD | Median | Min | Max |
| | Cord blood lead level (g/dL); | 1.0 | 1.1 | 0.7 | 1.0 | 0.4 | 5.7 | | Hair mercury (g/g); | 0.2 | 0.3 | 0.2 | 0.2 | 0.02 | 1.5 | | Cotinine level in saliva (ng/mL) | | | | | | | | 1st trimester of pregnancy; | 2.1 | 19.1 | 54.7 | 1.4 | <LOD | 400 | | 2nd trimester of pregnancy; | 2.2 | 26.1 | 64.2 | 2.3 | <LOD | 376 | | 3rd trimester of pregnancy; | 1.8 | 14.3 | 43.3 | 1.3 | <LOD | 339.5 | | Cotinine level in child urine (ng/mL) | | | | | | | | For one-year-old children; | 3.6 | 7.1 | 9.5 | 3.7 | <LOD | 66.7 | | For two-year-old children; | 5.3 | 8.1 | 7.0 | 5.8 | <LOD | 32.3 | | 1-Hydroxypyrene level in urine of pregnant women (g/g creatinine); | 0.4 | 0.5 | 0.6 | 0.4 | 0.01 | 8.5 | | Composite score for one-year-old children; | | | | | | | | Cognitive | | 106.0 | 10.8 | 105.0 | 80.0 | 145.0 | | Language | | 107.6 | 13.5 | 109.0 | 72.0 | 141.0 | | Motor | | 103.9 | 13.4 | 103.0 | 73.0 | 142.0 | | Composite score for two-year-old children; | | | | | | | | Cognitive | | 109.0 | 15.7 | 105.0 | 80.0 | 145.0 | | Language | | 101.3 | 13.3 | 97.0 | 74.0 | 144.0 | | Motor | | 112.6 | 15.5 | 110.0 | 73.0 | 154.0 |
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LOD: limit of detection.
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