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Table 1 Distribution of leachable lead concentration in the various types of source for children with B-Pb ≥ 25 μg/L.

From: Identification of sources of lead exposure in French children by lead isotope analysis: a cross-sectional study

    Quantile   
Type of source (n) Unit LOQ Min 25% 50% 75% 90% Max Mean Geometric Mean
Tap water (124) μg/L 1 0.5 0.5 0.5 2.75 7.5 74 4.1 1.3 (1.03-1.6)
Home dust (469) μg/m 2 1 0.5 5 11 26 66 3204 42.7 12 (10.7-13.6)
Dust from communal
areas (57)
μg/m 2 1 4 13 26 64.5 306 1103 94.3 33.7 (24.1-47.1)
Outdoor soil (81) mg/kg 0.5 2.1 13.9 29 81.6 169 395 66.2 33.9 (26.2-43.8)
Wipe of outdoor ground (13) μg/m 2 1 7 26.5 115 181 2132 3172 361.5 87.6 (31.6-243)
House paint (27) mg/g 0.05 0.03 2.5 14 54.2 102 149 33.1 9.84 (4.2-22.9)
  1. France, 2008-2009.
  2. a) Data not shown for unusual sources
  3. b) Concentrations for samples below the limit of quantification (LOQ) were replaced by LOQ/2.