Table 1.

Asthma and asthma-like symptoms questions from survey used to classify children into asthma groups

1.	Has a doctor ever said your child has asthma?
1a.	If “yes” has this been in the past 12 months?
2.	In the last 12 months, has your child taken asthma medication prescribed by a doctor?
3.	Has your child ever had wheeze or whistling sound in the chest?
3a	If “yes” has this happened in the past 12 months?
4	In the last 12 months, has your child's sleep been disturbed due to breathing problems (e.g., wheezing or whistling in the chest, coughing, shortness of breath, chest tightness)
5.	In the last 12 months, has your child's chest sounded wheezy or coughed during or after exercise when he or she did not have a cold?

Doctor-diagnosed asthma (probable asthma): Primarily “Yes” to questions 1–2 and “Yes” to at least one question between questions 3 and 5; Possible asthma (“At-Risk”): “Yes” to one or a combination of two or more questions between questions 3 and 5; No asthma: Response of “No” to all questions