Table 1—

Response prevalences from postal and laboratory questionnaires

ItemQuestionnaire1992–19931998–1999Changep-value
Responses nPostal30472803
Laboratory626615
Wheezing everPostal42.645.83.20.014
Laboratory43.054.311.3<0.001
Wheezing in last yearLaboratory29.836.46.60.013
Ever wheeze no coldPostal29.633.74.10.001
Ever short of breath and wheezePostal22.828.05.2<0.001
Woken wheezing in last yearPostal9.012.43.4<0.001
Laboratory12.717.75.00.01
Woken breathless in last yearPostal10.013.63.6<0.001
Laboratory8.28.70.5NS
Woken with chest tightness in last yearPostal19.723.94.2<0.001
Laboratory12.213.51.3NS
Woken coughing in last yearPostal30.937.86.9<0.001
Laboratory24.530.45.90.02
Asthma attack in last yearPostal5.48.83.4<0.001
Laboratory7.510.22.7NS
Mean change in symptom prevalencePostal4.3
Laboratory4.8
Current asthma medicationPostal7.512.85.3<0.001
Laboratory8.310.72.4NS
Asthma ever diagnosed by doctorLaboratory12.716.94.20.03
Overall mean changePostal4.4
Laboratory4.4
Hay feverPostal28.334.46.1<0.001
Laboratory26.137.811.7<0.001
  • Data are present as % unless otherwise stated.

  • ns: nonsignificant