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Table 3 Odds Ratios for symptoms at different threshold levels between different pollen grain levels

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

  Threshold level (pollen grains per cubic metre)
Levels Britain/Denmark Sweden Traffic lights
Low 1–30 0–10 0–30
Moderate 31–50 11–30 31–80
High 51–150 31–100 81–
Very High 150– 101–