Additionally, on the day of readmission (Lag0) there was a 2.3% increased likelihood of readmission due to ozone concentration levels when adjusted for PM 2.5 (OR 1.023, 95% CI 1.001–1.045, p = 0.042); however, only a near significance was seen between readmission and ozone concentration Lag0 when not adjusted for PM 2.5 (single-pollutant model) (OR 1.020, (95%CI 0.999–1.041) p = 0.064 [ 12 ].
Amongst the girls’ stratification, near statistical significance was seen for some individual markers of the traffic indices; however, no significance was found overall for the three traffic indices A likely dose–response relationship for traffic density exists for those children residing within the 5th quintile of traffic density (113 VMT/day/m 3 ) as there was a 21% higher repeated hospital admission recorded, HR 1.21 95% CL 0.99–1.49.
Borderline significance was seen with the traffic index “total arterial road and freeway length within 300 m of residence” and for the whole study population with greater than or equal to 750 m.