In the course of a clinic-anamnestic study performed from November 1984 to April 1985 by the collaborators of USL 40 Maternal-Infantile Service, among the children (1569) of the first primary school, 622 children has been selected for possible, probable and verified asthma. For making deeper the diagnosis, 358 children had gone to the respiratory allergologic section of division of pneumology and respiratory allergology of Cardarelli Hospital. The control group was formed from 12 children without atopic familiarity and without asthmatic tendency.
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