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A self-administered screening questionnaire was sent to 15.000 NFO households in January 2004. As is typical of household panel questionnaire studies, the household mem¬ber who knew the mostabout the family’s health status over the prior 12 months (usually the mother) completed the 10-item questionnaire for up to three household members. Individual members were asked about nasalsymptoms sxezing; runny, itchy, or stuffy nose) not attributable to an ic osode of the cold or flu during the past 12 months and ■ere dichotomized into those that reported symptoms 7 days in the :_t12 months. A 65-item follow-up questionnaire was sent to ic equal number of respondents, 4911 from each of those it: ops. The follow-up survey was fielded during May and ime. This samplingscheme was intended to capture individ- it_> at higher risk for nasal symptoms attributable to seasonal iilergies. In the follow-up survey, respondents were asked Lc ^iled questions about symptomexperience and severity; a&e of preventive measures and treatment-seeking behavior; rrract on sleep, cognition, and work/school performance; icJ comorbid conditions. From this follow-up survey,all ar ects were classified as rhinitis sufferers or nonsufferers Tired on their report of nasal symptoms in the previous 4 s tiks during May and June, an anticipated pollen season in many regionsof the U.S. Subjects were classified as rhinitis Efferers if they: 1) reported rhinitis/nasal symptoms (sneez- runny nose, itchy nose, or stuffy nose not related to cold ir flu) in the past 4weeks; 2) reported that the symptoms related to either seasonal allergies during the spring or fall or year-round nasal allergies; and 3) rated their util symptom severity as either mild,moderate, or severe. TIic following severity definitions were used: mild was ■sz ^/symptoms clearly present but easily tolerated; moder- ae was definite awareness of signs/symptoms that were a: