title: Asthma in older patients: factors associated with hospitalization.
abstract: BACKGROUND
  Although older adults (> or =65 years) with asthma have higher rates of hospitalization and death from asthma than younger adults, the reasons for this are not known.
  
  
  OBJECTIVE
  To determine whether patterns of care were less favorable for older than younger adults with asthma and to assess whether patient characteristics such as symptom severity and comorbid illnesses explain the higher rate of hospitalization.
  
  
  METHODS
  Prospective cohort study of 6590 adults with asthma in 15 managed care organizations in the United States. Participants completed a survey of demographics, symptoms, health status, comorbid illnesses, treatment, access to care, self-care knowledge, physician specialty, and health care use.
  
  
  RESULTS
  Among 6590 adults with asthma, 554 (8%) were 65 years or older and 1942 (29%) were aged 18 to 34 years. Older patients were more likely than younger patients to be men, white, non-Hispanic, and less educated. At baseline, older patients reported a greater frequency of asthma-related symptoms, such as daily cough (36% vs 22%, P<.001) and wheezing (27% vs 22%, P<.002). They were also more likely to report comorbid conditions, such as sinusitis (50% vs 38%), heartburn (35% vs 23%), chronic bronchitis (43% vs 16%), emphysema (19% vs 1%), congestive heart failure (8% vs 1%), and history of smoking (54% vs 34%) (all P<.001). Care appeared to be better for the older patients compared with the younger, including more frequent use of inhaled corticosteroids, greater self-management knowledge, and fewer reported barriers to care. In the follow-up year, older patients were approximately twice as likely to be hospitalized (14%) than were younger patients (7%) (P<.001). In multivariate analysis, however, older age was not predictive of future hospitalization (odds ratio, 1.05; 95% confidence interval, 0.68-1.61), after adjustment for sex, ethnicity, education, baseline asthma symptoms, health status, comorbid illnesses, and tobacco use. Factors independently associated with hospitalization included being female, nonwhite, less educated, and less physically healthy, and more frequent asthma symptoms.
  
  
  CONCLUSIONS
  Although the older adults with asthma had greater respiratory symptoms and more comorbidity than their younger counterparts, chronologic age was not an independent risk for hospitalization. Appropriate care for older adults with asthma should address asthma symptoms and other chronic conditions.
authors.affiliation: Department of Medicine, School of Medicine, Johns Hopkins University, Room 301, 1830 E Monument St, Baltimore, MD 21205, USA. gdiette@jhmi.edu
authors.forename: Gregory B
authors.initials: GB
authors.lastname: Diette
authors.forename: Jerry A
authors.initials: JA
authors.lastname: Krishnan
authors.forename: Francesca
authors.initials: F
authors.lastname: Dominici
authors.forename: Ed
authors.initials: E
authors.lastname: Haponik
authors.forename: Elizabeth Ann
authors.initials: EA
authors.lastname: Skinner
authors.forename: Donald
authors.initials: D
authors.lastname: Steinwachs
authors.forename: Albert W
authors.initials: AW
authors.lastname: Wu
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D001249:Asthma / Q000453:epidemiology* / Q000503:physiopathology / Q000628:therapy*; D015897:Comorbidity; D007722:Health Knowledge, Attitudes, Practice; D006297:Health Services Accessibility; D006299:Health Services for the Aged; D006760:Hospitalization / Q000706:statistics & numerical data*; D006801:Humans; D008329:Managed Care Programs; D008875:Middle Aged; D015999:Multivariate Analysis; D010043:Outcome and Process Assessment, Health Care; D011446:Prospective Studies; D012306:Risk; D012720:Severity of Illness Index; D012959:Socioeconomic Factors; D014481:United States / Q000453:epidemiology