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