Respiratory Syncytial Virus (RSV) Follow-Up Study (MK-0476-374)

Asthma was defined as a positive response to the Epidemiology Questionnaire item "Has your child had wheezing or whistling in the chest in the past 6/12 months?" for the period of 12 months prior to age 6 years.

Prognostic factors for asthma at age 6 years were derived from baseline characteristic, disease characteristic and family history data, and were identified by a forward stepwise regression model.

Atopic disorders include allergic rhinitis (AR) and/or atopic dermatitis (AD). Atopic disorders was defined as a positive response to the Epidemiology Questionnaire item "In the past 6/12 months, has your child had a problem with sneezing or runny or blocked nose when he/she did not have a cold or the flu?" for AR and/or a positive response to both of the following items for AD: "Has your child had an itchy rash which was coming and going at any time in the past 6/12 months?" and "Has this itchy rash at any time affected any of the following places: the folds of the elbows, behind the knees, in front of the ankles, under the buttocks, or around the neck, ears, or eyes?" for the period of 12 months prior to age 6 years.

Prognostic factors for atopic disorders at age 6 years were derived from baseline characteristic, disease characteristic and family history data, and were identified by a forward stepwise regression model.

Use of Chronic Asthma Therapy for the period of 12 months prior to the age of 6 years was defined by clinical review of reported concomitant medications.

Prognostic factors for use of chronic asthma therapy at age 6 years were derived from baseline characteristic, disease characteristic and family history data, and were identified by a forward stepwise regression model.