Prevalence of wheeze and other respiratory symptoms (white children).

*A few questionnaire items had different wording in the two groups. Among them was the question about wheeze ever: Attack group: "Has your child ever had attacks of wheezing?"; Whistling group: "Has your child ever had wheezing or whistling in the chest at any time in the past?" Based on this, the groups were labeled "attack group" and "whistling group".† Chi squared testsPrevalence of wheeze and other respiratory symptoms (white children).