Table 1.

Written questionnaire responses for selected questions by age group

Written question	Prevalence (all participants) n = 2,361	Prevalence (ages 13 to 14 years) n = 823
Have you had wheezing or whistling in the chest in the last 12 months?	32.8%	32.4%
Have you ever had asthma?	23.7%	24.2%
Do you need to bring an asthma inhaler to school with you?	9.2%	8.9%
In the last 12 months has your chest sounded wheezy during or after exercise?	34.7%	33.6%
In the last 12 months, have you had a problem with sneezing, or a runny or blocked nose when you did not have a cold or the flu?	58.8%	57.3%
Have you ever had hayfever?	63.9%	61.4%
Have any of your brothers or sisters, or your parents ever had asthma or hayfever ("family atopy")?	69.7%	70.9%
Do any of the adults in your home smoke cigarettes ("passive smoking")?	69.7%	64.2%
Have you ever smoked a cigarette?	38.1%	53.8%