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  • Title: Prevalence of asthma symptoms in video and written questionnaires among children in four regions of Finland.
    Author: Pekkanen J, Remes ST, Husman T, Lindberg M, Kajosaari M, Koivikko A, Soininen L.
    Journal: Eur Respir J; 1997 Aug; 10(8):1787-94. PubMed ID: 9272920.
    Abstract:
    The aim of this study was to determine whether there are regional differences in the prevalence of childhood asthma in Finland. A secondary objective was to assess the concordance between a written and a video questionnaire on asthma symptoms. In 1994-1995, the self-reported prevalence of asthma symptoms in four regions of Finland was studied among 11,607 schoolchildren aged 13-14 yrs, as part of the International Study of Asthma and Allergies in Childhood (ISAAC). The ISAAC written and video (AVQ 3,0) questionnaires were administered in the school setting. The prevalences of any wheezing during the previous 12 months in the ISAAC video questionnaire were 10% in East Finland (Kuopio County, n=2,821), 12% in South Finland (Helsinki area, n=2,771), 12% in Southwest Finland (Turku and Pori County, n=2,983), and 11% in North Finland (Lapland, n=3,032). The prevalences in the ISAAC written questionnaire were 13, 20, 15, and 16%, respectively. The surveys were performed during winter, except in Helsinki where the survey was carried out mainly during the spring pollen season. During autumn, the prevalence in the written questionnaire in Helsinki was 16%. In multivariate analysis, boys had a lower prevalence than girls, and smokers a threefold higher prevalence than nonsmokers. In conclusion, the prevalence of childhood asthma is lower in Finland than in other European countries, and may be even lower in the eastern part of the country. In contrast to the results from some other European countries, prevalences were lower in the video than in the written questionnaire, which suggests that translating the word "wheezing" into other languages, including Finnish, may produce results that cannot be compared. The strong association of smoking with wheeze both in the video and written questionnaires should be considered in further analysis of the ISAAC study.
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