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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

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

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)   
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)   
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)
  1. *Adjusted for ethnicity and SEIFA