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Table 1 Study design.

From: Systemic and local eosinophil inflammation during the birch pollen season in allergic patients with predominant rhinitis or asthma

  Visit 1 Inclusion Visit 2 Baseline out of season Visit 3 Birch pollen season
Blood sample x x x
Spirometry x x x
Skin prick test x   
Specific IgE for birch x   
Nasal lavage   x x
Induced sputum   x x
   - symptoms    x
   - medication    x
   - PEFR    x
  1. x: performed investigations at each visit