Table 5 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
Road/Traffic Metric | Unadjusted OR (95% CI) | Adjusted OR* (95% CI) |
|---|---|---|
Kernel score indicator for high traffic | 2.73 (2.19, 3.40) | 2.51 (2.00, 3.15) |
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) |
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) |
Distance to nearest major road (km) | 1.24 (1.00, 1.54) | 1.20 (0.96, 1.49) |
Length of road within buffer radius (km) | Â | Â |
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) |
Density of road within buffer radius (km/km2) | Â | Â |
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) |