Table 2.

Indicators of disease status

Indicator of Disease	Description	Known/Unknown
Confirmed asthma	When parent questionnaire response to the question “has a doctor ever diagnosed this child as having asthma” was confirmed through administrative records regarding clinic visits and the prescription of asthma medication	146/59
Current asthma	Labeled Asthmatics and Non-Asthmatics reporting an asthma attack in the last 12 months	192/13
Questionnaire-defined asthma	Positive response to “has a doctor ever diagnosed this child as having asthma” on parent questionnaire	186/19
Phadiatop – Atopy/Allergen screen	Positive serum test to a panel of at least 15 common allergens	173/32
Foodscreen – Food allergen screen	Positive serum test to a panel of 6 common allergy provoking foods (cows milk protein, egg white wheat codfish peanut and soybean)	190/15

Column 2 provides a description of each disease indicator. Column 3 shows the number of subjects for which a given disease status was unknown.