Table 5 |
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Risk estimates for ED presentation for asthma in children and young adults (0-19 years) in Perth, Western Australia, by using four different Traffic Metrics |
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Road/Traffic Metric |
Unadjusted OR (95% CI) |
Adjusted OR* (95% CI) |
|
|
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Kernel score indicator for high traffic |
2.73 (2.19, 3.40) |
2.51 (2.00, 3.15) |
|
|
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|
Distance-weighted traffic density - All traffic (1000 vehicle km travelled per peak hour of morning traffic) |
0.72 (0.62, 0.84) |
0.73 (0.62, 0.85) |
|
|
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|
Distance-weighted traffic density - Truck traffic (1000 truck km travelled per peak hour of morning traffic) |
0.01 (0.00, 0.12) |
0.01 (0.00, 0.16) |
|
|
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|
Distance to nearest major road (km) |
1.24 (1.00, 1.54) |
1.20 (0.96, 1.49) |
|
|
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Length of road within buffer radius (km) |
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|
50 m |
0.46 (0.05, 3.90) |
0.57 (0.06, 5.03) |
|
100 m |
0.43 (0.19, 0.93) |
0.46 (0.21, 1.01) |
|
150 m |
0.76 (0.50, 1.16) |
0.74 (0.48, 1.13) |
|
200 m |
0.95 (0.73, 1.24) |
0.93 (0.71, 1.21) |
|
250 m |
1.05 (0.88, 1.26) |
1.01 (0.84, 1.22) |
|
300 m |
1.06 (0.92, 1.21) |
1.03 (0.90, 1.18) |
|
350 m |
1.05 (0.94, 1.16) |
1.02 (0.92, 1.14) |
|
400 m |
1.06 (0.98, 1.16) |
1.05 (0.96, 1.14) |
|
|
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|
Density of road within buffer radius (km/km2) |
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|
50 m |
0.99 (0.97, 1.01) |
0.99 (0.97, 1.01) |
|
100 m |
0.97 (0.94, 0.99) |
0.97 (0.95, 1.00) |
|
150 m |
0.98 (0.95, 1.01) |
0.98 (0.95, 1.01) |
|
200 m |
0.99 (0.96, 1.03) |
0.99 (0.96, 1.02) |
|
250 m |
1.01 (0.97, 1.05) |
1.00 (0.97, 1.04) |
|
300 m |
1.02 (0.98, 1.06) |
1.01 (0.97, 1.05) |
|
350 m |
1.02 (0.98, 1.06) |
1.01 (0.97, 1.05) |
|
400 m |
1.03 (0.99, 1.08) |
1.02 (0.98, 1.07) |
|
|
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*Adjusted for ethnicity and SEIFA |
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Pereira et al. International Journal of Health Geographics 2009 8:63 doi:10.1186/1476-072X-8-63 |
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