Confounding Factor | Factors of analysis | 2007 | Â | 2008 | Â |
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 |  | Proportional Odds Ratio (95%CI) | P-value | Proportional Odds Ratio (95%CI) | P-value |
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- | Perioda | 0.40 (0.32-0.50) | < 0.001 | 0.49 (0.40-0.61) | < 0.001 |
Medication | Period | 0.42 (0.33-0.53) | < 0.001 | 0.48 (0.39-0.60) | < 0.001 |
 | Medication useb | 2.77 (1.74-4.43) | < 0.001 | 3.57 (2.47-5.17) | < 0.001 |
Nasal steroid | Perioda | 0.40 (0.31-0.51) | < 0.001 | 0.48 (0.38-0.59) | < 0.001 |
 | Nasal steroidc | 1.51 (0.76-2.97) | 0.24 | 2.43 (1.26-4.70) | 0.008 |
- The proportional odds ratio, the 95% confidence interval (CI) and the p values for the period and the confounding factor for each model are shown for 2007 and 2008.
- a The period refers to the late (index) versus the early season (reference) of the grass pollen season.
- bMedication use refers to the daily use of any medication for hay fever symptoms (index) versus no use of medication (reference).
- cNasal steroid refers to the daily use of nasal steroid spray (index) versus no use of nasal steroid spray (reference).