Table A1

Asthma questions included in the questionnaire

Group A	Group B
Have you been told by a doctor that you have asthma?	Do you ever have chest tightness?
Do you have asthma?	Do you wake in the night with chest tightness?
Have you ever had asthma?	Do you wake in the night wheezing?
Do you ever wheeze?	Do you cough when you wake up in the morning?
	Do you wake up because of coughing?
	Do you wheeze because of exposure to cold air?
	Do you wheeze when you exercise?
	Do you wheeze because of exposure to pollen?
	Do you wheeze because of exposure to animals?
	Do you use asthma drugs?