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Table 4 Lead concentrations compared with international standards

From: Environmental assessment of pediatric Lead exposure in Tehran; a prospective cross-sectional study

Lead level Median (IQR) Standard limit p-value
Scratched paint (ppm) 105.6 (71.1–123.7) 90 (CPSCa) 0.28
House floor dust (μg/ft2) 77.4 (66.5–84) 10 (EPAb) < 0.001
Interior window-sills dust (μg/ft2) 291 (231.2–345.2) 100 (EPAb) < 0.001
Tap water (μg/kg) 63.5 (36–78.9) 15 (EPAb) < 0.001
Spice (μg/kg) 56.7 (20.6–98.5) 300 (WHOc) < 0.001
  1. a Consumer product safety commission
  2. b Environmental protection agency
  3. c World health organization