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Table 4 Modification of the PM2.5 mass association across 26 US by PM2.5 composition.

From: Fine particulate air pollution and its components in association with cause-specific emergency admissions

   P-value for modifier % 95% CI IQR
Cardiovascular disease
Traffic
  Br 0.01 0.81 0.23 1.40 0.00010
Sea salt, street salt
  Na+ < 0.01 0.87 0.35 1.39 0.00945
Industrial combustion sources
  Ni < 0.01 0.90 0.46 1.35 0.00012
  V 0.05 0.73 0.01 1.44 0.00017
Soil and road dust
  Al 0.05 0.53 0.00 1.07 0.00193
Myocardial Infarction
Traffic
  OC 0.03 1.03 0.13 1.94 0.07060
Industrial combustion sources
  Ni 0.04 1.13 0.04 2.22 0.00012
  As < 0.01 2.35 0.84 3.85 0.00006
  Cr 0.05 1.34 0.00 2.68 0.00010
Sea salt, street salt
  Na+ 0.03 1.42 0.16 2.68 0.00945
Soil and industrial sources
  Mn 0.03 0.99 0.14 1.85 0.00018
Wood burning and soil
  K 0.05 1.61 0.01 3.22 0.00270
Diabetes
Traffic
  OC < 0.01 -2.42 -3.79 -1.06 0.07060
  EC 0.02 -2.12 -3.84 -0.39 0.02469
Industrial combustion sources
  As 0.04 2.16 0.11 4.21 0.00006
  SO4 2- 0.01 2.91 0.92 4.89 0.11610
Congestive heart failure
Soil and road dust
  Al 0.07 0.77 -0.07 1.61 0.00193
Industrial combustion sources
  Ni 0.07 0.64 -0.04 1.32 0.00012
Respiratory disease
Sea salt, street salt
  Na+ 0.06 0.94 -0.02 1.91 0.00945
Industrial combustion sources
  Ni 0.06 0.75 -0.03 1.53 0.00012
  1. Results are expressed as % increase in cause-specific hospital admission per 10 μg/m3 increase in PM2.5 for an IQR increase in the Species to PM2.5 mass proportions