BACKGROUND AND OBJECTIVES: The aims of the study were to assess the accuracy of self-reported asthma and notified year of asthma onset. METHODS: The study was performed on a sample of 365 subjects, 18-60 years old, with clinically diagnosed onset of asthma between 1983 and 1986. All subjects were investigated 10 years later, in 1996, with a respiratory questionnaire about the items of asthma and year of onset. The material was analyzed with logistic regression models. RESULTS: Of the 289 subjects who returned the questionnaire, asthma was reconfirmed in 251 subjects. In a logistic regression model, asthma severity was significantly associated with confirmation of asthma. The median difference between the "true" year of onset and the reported year 10 years later, the recall period was zero, with a 10th to 90th interpercentile range of -2 to 6 years. The recall period was not associated with asthma severity, bronchial hyperresponsiveness, smoking, atopy, or sex. CONCLUSION: Self-reported asthma is biased in relation to disease severity, meaning that subjects with mild disease were less prone to report their asthma. Reported year of asthma onset among adults seems to be rather accurate, with no obvious dependent misclassifications.
BACKGROUND AND OBJECTIVES: The aims of the study were to assess the accuracy of self-reported asthma and notified year of asthma onset. METHODS: The study was performed on a sample of 365 subjects, 18-60 years old, with clinically diagnosed onset of asthma between 1983 and 1986. All subjects were investigated 10 years later, in 1996, with a respiratory questionnaire about the items of asthma and year of onset. The material was analyzed with logistic regression models. RESULTS: Of the 289 subjects who returned the questionnaire, asthma was reconfirmed in 251 subjects. In a logistic regression model, asthma severity was significantly associated with confirmation of asthma. The median difference between the "true" year of onset and the reported year 10 years later, the recall period was zero, with a 10th to 90th interpercentile range of -2 to 6 years. The recall period was not associated with asthma severity, bronchial hyperresponsiveness, smoking, atopy, or sex. CONCLUSION: Self-reported asthma is biased in relation to disease severity, meaning that subjects with mild disease were less prone to report their asthma. Reported year of asthma onset among adults seems to be rather accurate, with no obvious dependent misclassifications.
Authors: Eva Halapi; Daniel F Gudbjartsson; Gudrun M Jonsdottir; Unnur S Bjornsdottir; Gudmar Thorleifsson; Hafdis Helgadottir; Carolyn Williams; Gerard H Koppelman; Andrea Heinzmann; H Marike Boezen; Aslaug Jonasdottir; Thorarinn Blondal; Sigurjon A Gudjonsson; Adalbjorg Jonasdottir; Theodora Thorlacius; Amanda P Henry; Janine Altmueller; Marcus Krueger; Hyoung Doo Shin; Soo-Taek Uh; Hyun Sub Cheong; Brynja Jonsdottir; Bjorn R Ludviksson; Dora Ludviksdottir; David Gislason; Choon-Sik Park; Klaus Deichmann; Philip J Thompson; Matthias Wjst; Ian P Hall; Dirkje S Postma; Thorarinn Gislason; Augustine Kong; Ingileif Jonsdottir; Unnur Thorsteinsdottir; Kari Stefansson Journal: Eur J Hum Genet Date: 2010-04-07 Impact factor: 4.246
Authors: Kate M Scott; Michael Von Korff; Matthias C Angermeyer; Corina Benjet; Ronny Bruffaerts; Giovanni de Girolamo; Josep Maria Haro; Jean-Pierre Lépine; Johan Ormel; José Posada-Villa; Hisateru Tachimori; Ronald C Kessler Journal: Arch Gen Psychiatry Date: 2011-08
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Authors: Kirsi Karvala; Elina Toskala; Ritva Luukkonen; Jukka Uitti; Sanna Lappalainen; Henrik Nordman Journal: Int Arch Occup Environ Health Date: 2011-07-19 Impact factor: 3.015
Authors: Bridget J McCarthy; Kristin Rankin; Dora Il'yasova; Serap Erdal; Nicholas Vick; Francis Ali-Osman; Darell D Bigner; Faith Davis Journal: Cancer Epidemiol Biomarkers Prev Date: 2011-02 Impact factor: 4.254