Table 1.

Distributions of 1-OHPG levels (pmol/mL) in urine and traffic density (VMT/d/mi2) within 500 feet of location

Value1-OHPG (pmol/mL)Residential traffic (VMT/d/mi2)Workplace traffic (VMT/d/mi2)
n304304221
Mean (SD)0.58 (1.2)43,675 (87,877)87,948 (178,705)
Minimum≤0.05*00
% Minimum453429
25th Percentile0.0500
50th Percentile0.1810,98638,717
75th Percentile0.5154,577108,368
90th Percentile1.4112,057187,549
Maximum8.9687,2501,499,208
  • * The reporting limit for 1-OHPG was 0.05 pmol/mL.