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Table 1 Distribution of prenatal lead concentrations in the study sample at three time points (μg/dL)

From: Low-level prenatal lead exposure and infant sensory function

  Infants with Newborn ABR Data Infants with 6-Wk Grating VA Data
Lead exposure N GM (SD)a Percentile N GM (SD)a Percentile
    50th 75th 90th 95th Max.    50th 75th 90th 95th Max.
Mid-pregnancyb 343 2.4 (2.5) 2.9 4.4 5.5 6.4 9.0 1038 2.4 (2.6) 2.9 4.4 6.3 8.2 19.0
Late-pregnancyc 362 2.7 (2.3) 3.0 4.5 6.2 7.2 76.0 1058 2.9 (2.2) 3.3 4.7 6.4 7.7 69.8
Cordd 321 <LOQ <LOQ 3.2 5.0 5.7 24.7 949 <LOQ 2.1 3.3 4.7 5.5 13.5
  1. a GM geometric mean, SD standard deviation
  2. bMean (SD) gestational age at mid-pregnancy visit is 15.7 (2.2) weeks for ABR subset and 15.5 (1.9) weeks for VA data
  3. cMean (SD) gestational age at late-pregnancy visit is 38.8 (1.3) weeks for ABR subset and 39.3 (1.3) weeks for VA data
  4. dMean (SD) gestational age at birth is 39.2 (1.1) weeks for ABR subset and 39.7 (1.1) weeks for VA data