Table 4—

Frequency of asthma attacks, symptoms, respiratory infections and use of supplementary β2-agonists and mean values of morning peak expiratory flow and daily variability

Incident episodesPrevalent episodes
Asthma attacks1.01.9
Nocturnal cough3.17.9
Wheeze3.79.2
Respiratory infections0.40.8
Eye irritation3.69.0
Throat irritation3.710.0
Nose irritation5.217.1
Morning values L·min−1332.3 (87.5)
Daily variability %8.7 (9.2)
  • Data are presented as % or mean±sd

  • Total incidence rate: (total number of incident cases×100)/total number of person-days at risk

  • total prevalence rate: (total number of prevalent cases×100)/total number of person-days