title: Agreement between current and active asthma classification methods, Asthma Call-back Survey, 2011-2012.
abstract: Various approaches have been developed to identify persons with asthma using survey data. To assess agreement between current and active asthma classifications, 2011-2012 Asthma Call-back Survey landline telephone household data from 38 states, District of Columbia, and Puerto Rico for adults aged ≥18 years who have ever been told by a health professional they have asthma were analyzed.
  
  
  
  Respondents were classified to have current asthma if they reported still having asthma, and active asthma if they reported within the past year: 1) talking to a doctor about asthma, 2) taking asthma medication, or 3) having any symptoms of asthma. Agreement between classifications was assessed using the Kappa statistic.
  
  
  
  Among adults ever told by a health professional they have asthma, an estimated 72% had current asthma and 75% had active asthma. Overall, 67% of individuals met classifications of both current and active asthma and 20% had neither current nor active asthma (Kappa = 0.68). The Kappa increased to 0.72 when talking to a doctor about asthma was removed from the active asthma classification.
  
  
  
  Results indicated substantial agreement between current and active asthma. Agreement was strengthened when talking to a doctor about asthma was removed from the active asthma classification.
authors.affiliation: a Respiratory Health Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention (CDC) , Morgantown , West Virginia , USA.
authors.forename: Katelynn E
authors.initials: KE
authors.lastname: Dodd
authors.affiliation: a Respiratory Health Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention (CDC) , Morgantown , West Virginia , USA.
authors.forename: Jacek M
authors.initials: JM
authors.lastname: Mazurek
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001249:Asthma / Q000145:classification*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010817:Physician-Patient Relations; D011647:Puerto Rico; D011795:Surveys and Questionnaires; D013689:Telephone; D014481:United States; D055815:Young Adult
keywords: ACBS; BRFSS; Current asthma; active asthma; agreement; classification