Objectives: To describe the prevalence of asthma and asthma variants in schoolchildren from Recife in 2002, and to compare these data with data from ; to analyze the relationship between maternal schooling and the presence of asthma or worsening asthma; and to evaluate the diagnostic accuracy of the yearly prevalence of wheezing as an asthma indicator.Methods: Cross-sectional study. A probabilistic sample of 3,086 and 2,774 13-and 14-year-old students answered a written questionnaire in 1994-95 and 2002, as part of the International Study of Asthma and Allergies in Childhood.Results: The following prevalence rates were observed in 1994-95 and 2002, respectively: cumulative prevalence of referred asthma: 21 vs 18.2%; cumulative prevalence of wheezing: 39 vs 38%; yearly prevalence of wheezing: 19.7 vs 19.4%; yearly prevalence of night cough: 31 vs 38%; yearly prevalence of exercise-induced wheezing: 20.6 vs 23.8%. The yearly prevalence of asthma attacks was 16.3 vs 15.2% for 1 to 3 attacks; 2.7 vs 1.2% for 4 to 12 attacks; and 1 vs 0.4% for more than 12 attacks. The yearly prevalence of attacks that disturbed sleep was 13 and 10.3%. The yearly prevalence of attacks with compromised speech was 4.8 and 4.1%. Higher levels of maternal schooling were related to higher cumulative prevalence of referred asthma and to cumulative and yearly prevalence of wheezing.
Conclusions:The prevalence of asthma and its severe forms is high in teenager students in Recife. It is also related to higher levels of maternal schooling.
IntroductionAsthma is a chronic inflammatory disease of the airways, predominantly eosinophilic, which results in a recurrent obstruction of the airflow, reversible spontaneously or in response to therapy. Atopic disease is the most frequently identified predisposing factor. 1-4 It constitutes a public health problem, as much for its prevalence as for its morbidity. [5][6][7][8][9] During phase one of ISAAC, (International Study of Asthma and Allergies in Childhood), 463,801 13 and 14 year-old adolescents and 257,800 children aged 6 and 7 years of age, from 56 countries were studied by questionnaire. The average cumulative prevalence of asthma reported was 11.3%, varying from 1.4 to 30.4%. Brazil was eighth in the ranking. 5 This project investigated 20,544 schoolchildren aged 13-14 years and 13,604 aged 6-7 years, in Curitiba, Itabira, Recife, Salvador, São Paulo, Porto Alegre and Uberlândia. In the first group, the reported prevalence of asthma was 9.8% for males and 10.2% for females. In the 6-7 year-old group, it was 7.3 and 4.9%, respectively. 6 In Recife, the ISAAC data from 1994-95 for 1,410 schoolchildren aged 6 and 7 years and 3,086 pupils aged 13 and 14 years old, demonstrated a reported asthma prevalence of 20.4 and 19.7%, respectively. 7 Further Brazilian studies using methods similar to those of the ISAAC project have also been performed recently. In schoolchildren from Uberlândia aged 6 and 7 In addition to the point-by-point assessments, the comparison of different periods allows ...