Association between grass, tree and weed pollen and asthma health outcomes in Adelaide, South Australia: a time series regression analysis.

For February, the IRR was significantly increased for asthma-related ambulance call-outs (IRR 1.98; 95% CI 1.06 to 3.72, p=0.03), emergency presentations (IRR 1.36; 95% CI 1.15 to 1.61, p<0.001) and with borderline significance for hospitalisations (IRR 1.22; 95% CI 1.00 to 1.48, p=0.05).

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The models indicated highly significant variations for all three pollen types over the years, as shown in figure 2 .

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