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Table 4 Means and standard deviations of the four traffic metrics

From: Residential traffic exposure and children's emergency department presentation for asthma: a spatial study

Road/Traffic Metric Cases Controls All
  Mean SD Mean SD Mean SD
Kernel score indicator for high traffic NA NA NA NA NA NA
Distance-weighted traffic density - All traffic
(1000 vehicle km travelled per peak hour of morning traffic)
0.48 0.73 0.64 0.78 0.59 0.77
Distance-weighted traffic density - Truck traffic
(1000 truck km travelled per peak hour of morning traffic)
0.02 0.04 0.03 0.04 0.03 0.04
Distance to nearest major road (km) 0.63 0.45 0.59 0.45 0.60 0.45
Length of road within buffer radius (km)       
50 m 0.10 0.04 0.10 0.05 0.10 0.05
100 m 0.44 0.12 0.45 0.13 0.45 0.13
150 m 0.96 0.23 0.98 0.24 0.97 0.23
200 m 1.70 0.36 1.71 0.38 1.70 0.37
250 m 2.63 0.52 2.61 0.55 2.62 0.54
300 m 3.73 0.70 3.70 0.74 3.71 0.73
350 m 5.01 0.89 4.97 0.97 4.98 0.94
400 m 6.45 1.09 6.37 1.21 6.40 1.17
Density of road within buffer radius (km/km2)       
50 m 12.90 5.45 13.17 5.59 13.08 5.54
100 m 13.89 3.85 14.37 4.00 14.20 3.96
150 m 13.55 3.21 13.77 3.34 13.70 3.30
200 m 13.48 2.82 13.54 2.99 13.52 2.93
250 m 13.33 2.63 13.26 2.77 13.28 2.72
300 m 13.15 2.46 13.05 2.60 13.09 2.55
350 m 12.97 2.29 12.87 2.51 12.90 2.44
400 m 12.81 2.17 12.64 2.40 12.70 2.33