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Table 5 Sensitivity analyses including best predictor in each category, all summary measures.

From: Land use regression modeling of intra-urban residential variability in multiple traffic-related air pollutants

Indicator Type

Traffic Indicator

Estimate(s), p-value(s) from multivariate model

Model R2

Base model (w/out traffic)

  

R2 = .74

Cumulative Density scores

Unweighted 500 m traffic density (n = 57)

β1 = 4.74*10-4 (.17)

R2 = .75

Summary Measures

Total roadway length:

  
 

50 meters (n = 57)

β1 = 1.31*10-4 (.35)

R2 = .74

 

100 meters (n = 57)

β1 = 1.48*10 -4 (.02)

R 2 = .76

 

200 meters (n = 57)

β1 = 1.42*10-5 (.56)

R2 = .74

 

300 meters (n = 57)

β1 = 5.54*10-6 (.57)

R2 = .74

Distance-based measures

Distance to nearest designated truck route (n = 57)

β1 = 1.80*10-5 (.62)

R2 = .74

Characteristics of nearest major road

Average daily traffic (ADT) (n = 57)

β1 = -3.04*10-6 (.25)

R2 = .74

  1. Final model bolded; models with diesel-based terms italicized. Traffic indicators for PM 2.5
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Environmental Health

ISSN: 1476-069X