Effect modifier | Factors for analysis | 2007 | Â | 2008 | Â |
---|---|---|---|---|---|
 |  | Proportional Odds Ratio (95% CI) | P-value | Proportional Odds Ratio (95%CI) | P-value |
- | Perioda | 0.40 (0.32-0.50) | < 0.001 | 0.49 (0.40-0.60) | < 0.001 |
Birch sensitization | Perioda | 0.32 (0.21-0.48) | < 0.001 | 0.53 (0.36-0.77) | < 0.001 |
 | Birch+b | 0.71 (0.31-1.59) | 0.40 | 1.26 (0.64-2.48) | 0.51 |
 | Birch+*period | 1.40 (0.83-2.38) | 0.20 | 0.91 (0.56-1.44) | 0.68 |
Birch sensitization and pollen season | Perioda | NDd | Â | 0.52 (0.36-0.76) | < 0.001 |
 | Birch+ b | ND |  | 1.22 (0.61-2.43) | 0.58 |
 | Birchseasonc | ND |  | 0.92 (0.58-1.49) | 0.76 |
Birch sensitization and pollen season | Perioda | NDd | Â | 0.54 (0.43-0.68) | < 0.001 |
 | Birch+b | ND |  | 0.97 (0.59-1.58) | 0.90 |
 | Birchseasonc | ND |  | 0.89 (0.65-1.23) | 0.49 |
 | Birch+*Birchseason | ND |  | 1.48 (0.94-2.33) | 0.09 |
HDM | Perioda | 0.38 (0.29-0.50) | < 0.001 | 0.52 (0.41-0.66) | < 0.001 |
 | HDMe | 0.73 (0.27-1.93) | 0.52 | 1.25 (0.55-2.84) | 0.59 |
 | HDM * period | 1.27 (0.78-2.08) | 0.34 | 0.68 (0.39-1.18) | 0.17 |