Skip to main content

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

Back to article page

International Journal of Health Geographics

ISSN: 1476-072X