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  • Title: Physician-diagnosed asthma and allergic rhinitis in Manitoba: 1985-1998.
    Author: Dik N, Anthonisen NR, Manfreda J, Roos LL.
    Journal: Ann Allergy Asthma Immunol; 2006 Jan; 96(1):69-75. PubMed ID: 16440535.
    Abstract:
    BACKGROUND: A worldwide increase has been noted in the prevalence of asthma, but the data for other allergic disorders are less consistent. OBJECTIVE: To study 14-year trends in utilization of physician resources for asthma and compare them to trends for allergic rhinitis. METHODS: We studied visits to physicians by Manitoba residents for asthma (International Classification of Diseases, Ninth Revision, Clinical Modification [ICD-9-CM] code 493) and allergic rhinitis (ICD-9 code 477) between 1985 and 1998. Prevalence and incidence of physician resources utilization were calculated annually for the total population and by age groups. Aggregate statistics and frequency of physician resources utilization were also analyzed. RESULTS: The prevalence and incidence of physician resources utilization for asthma increased more than for allergic rhinitis; differences were most striking in the youngest age groups. In adults, the differences were smaller and changed little with time. Most of the increase in asthma care occurred in children and in people without allergic rhinitis. Overall, 17% of Manitobans were diagnosed as having asthma, and the average asthmatic patient made 6 visits. Approximately 14% had an allergic rhinitis diagnosis, each person being seen twice on average. Coexistence of asthma and allergic rhinitis led to increased physician resources utilization for each of the conditions. CONCLUSIONS: Trends in utilization of physician resources for allergic rhinitis differed strikingly from trends for asthma, particularly in the youngest age group. Asthma and allergic rhinitis affected comparable proportions of the population, but a diagnosis of asthma resulted in much higher utilization of physician resources. The relationship of physician-diagnosed asthma and atopy, as indicated by the diagnosis of allergic rhinitis, appears to have weakened with time in children but not in adults.
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