Table 2—

Prevalence of positive answers to questions concerning wheezing, dyspnoea and asthma

Survey year
197419921998
Subject n225912291139
Q1 Physician diagnosis of asthma or asthmatic bronchitis5.011.611.0
Q2 Dyspnoea on effort more easily than other children0.92.64.1
Q3 Parent reported asthmatic attacks (attacks of breathlessness and audible wheezing)3.610.89.4
Q4 Parent reported asthmatic attacks during the past year1.64.03.7
Asthma5.512.212.0
  • Data are presented as per cent of total population

  • affirmative answer to question 1 or to question 2 and 3

  • p<0.0001, Chi-squared test

  • p=ns