Incidence studies offer a better opportunity to study risk factors for asthma than do prevalence studies.
However, regular prospective follow-ups of large cohorts are difficult to perform, and that is why direct measurement of the incidence rate of asthma is almost impossible.
Thus, cross-sectional follow-up studies of defined cohorts can be used to provide data on incidence.
In 1986, a postal questionnaire survey on respiratory symptoms and diseases was performed in the northernmost province of Sweden.
The population sample comprised all subjects born in 1919-20,1934-5, and 1949-50 in eight representative areas of the province, which comprises 25% of the total area of Sweden.
Completed answers were given by 5698 subjects (86%) of the 6610 subjects invited to the study.
In 1992, the cohort was invited to a follow-up survey during the same season as in 1986, and 6215 subjects were traced.
Of the 5393 subjects who answered the questionnaire, 4932 had participated in the 1986 survey, or 87% of those who participated in 1986.
For the period 1986-92, the cumulative incidences of asthma were 4.9 and 5.0%, respectively, as assessed by the questions, « Have you ever had asthma ? » and « Have you been diagnosed as having asthma by a physician ? » Thus, the results indicate a mean annual cumulative incidence of asthma of 0.8%. (...)
Mots-clés Pascal : Asthme, Incidence, Epidémiologie, Questionnaire, Facteur risque, Suède, Europe, Adulte, Homme, Appareil respiratoire pathologie, Bronchopneumopathie obstructive
Mots-clés Pascal anglais : Asthma, Incidence, Epidemiology, Questionnaire, Risk factor, Sweden, Europe, Adult, Human, Respiratory disease, Obstructive pulmonary disease
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 98-0012975
Code Inist : 002B11B. Création : 17/04/1998.