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Table 2 Threshold levels

From: Grass pollen allergy in children and adolescents-symptoms, health related quality of life and the value of pollen prognosis

Symptom Threshold level Pollen grain per cubic metre level OR (95% CI) P-value
Nose Sweden Low–Medium 0.98(0.84–1.13) 0.74
   Medium–High 1.42(1.19–1.69) <0.0001
   High–Very high 1.24(1.07–1.44) 0.0049
  Britain/Denmark Low–Medium 1.18(1.02–1.37) 0.026
   Medium–High 1.37(1.16–1.61) 0.0002
   High–Very high 1.04(0.88–1.24) 0.64
  Traffic lights Low–Medium 1.40(1.19–1.65) <0.0001
   Medium–High 1.19(1.02–1.40) 0.027
Eye Sweden Low–Medium 1.02(0.89–1.18) 0.77
   Medium–High 1.34(1.10–1.61) 0.028
   High–Very high 1.30(1.14–1.48) <0.0001
  Britain/Denmark Low–Medium 1.12(0.96–1.31) 0.15
   Medium–High 1.38(1.17–1.62) <0.0001
   High–Very high 1.30(1.09–1.56) 0.0038
  Traffic lights Low–Medium 1.33(1.13–1.56) 0.0007
   Medium–High 1.30(1.14–1.48) <0.0001
Lung Sweden Low–Medium 0.92(0.76–1.10) 0.35
   Medium–High 1.10(0.89–1.35) 0.39
   High–Very high 1.27(1.13–1.43) <0.0001
  Britain/Denmark Low–Medium 0.95(0.83–1.10) 0.51
   Medium–High 1.21(1.03–1.43) 0.020
   High–Very high 1.20(1.01–1.42) 0.041
  Traffic lights Low–Medium 1.02(0.85–1.23) 0.82
   Medium–High 1.27(1.12–1.45) 0.0003
Total Sweden Low–Medium 1.04(0.91–1.18) 0.57
   Medium–High 1.35(1.15–1.59) 0.0003
   High–Very high 1.25(1.11–1.42) 0.0004
  Britain/Denmark Low–Medium 1.14(1.00–1.29) 0.046
   Medium–High 1.39(1.20–1.62) <0.0001
   High–Very high 1.14(0.96–1.35) 0.12
  Traffic lights Low–Medium 1.36(1.18–1.58) <0.0001
   Medium–High 1.25(1.10–1.42) 0.0008