Decrease in the Prevalence and Severity of Asthma Symptoms Among 13–14- Year-Olds in Ibadan City, Nigeria: Repeated Cross-Sectional Studies 1995-2018, Global Asthma Network Phase I
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Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Article Description
Background: The Global Asthma Network (GAN) has continued the surveillance work of the International Study of Asthma and Allergies in Childhood (ISAAC). We aimed to investigate if the increase noted in ISAAC Phase I (1995) to III (2001-2002) studies in Ibadan, Nigeria continued; and also survey asthma medicines uses. Methods: GAN Phase I in Ibadan used the same methods as ISAAC Phases I and III. Data was obtained from February - July 2018 by self-completed questionnaires at school, on symptoms and risk factors for asthma and allergy, asthma management, school absence and hospitalisations. Findings: There were 2897 adolescents from 23 secondary schools. For current wheeze, there was an absolute prevalence fall per decade of -1·4 with -1 standard error (SE), from 2002 (ISAAC Phase III) to 2018 (GAN Phase I), 16 years apart. This pattern was evident for prevalence of reported asthma ever, severe asthma symptoms, and night cough with ≥ 1 SE. From ISAAC Phase I to GAN Phase I (23-year interval) there was no absolute prevalence fall in current wheeze (-0·1 SE), but there was a fall in the absolute prevalence of reported asthma ever, severe asthma symptoms, and night cough, with a decrease of ≥ 1 SE, except for severe asthma symptoms (-0·2 SE). There was limited self-reported use of appropriate asthma medicines. Interpretation: The prevalence and severity of asthma symptoms, although still high, has declined among adolescents in Ibadan over the last three decades. The high burden of asthma symptoms would be mitigated by improved access to affordable, effective asthma treatments. Funding Information: This research was funded by the National Institute for Health Research (NIHR) (IMPALA, grant reference 16/136/35) using UK aid from the UK Government to support global health research. The views expressed in this publication are those of the authors and not necessarily those of the NIHR or the UK Department of Health and Social Care. Declaration of Interests: The authors declare that they have no conflict of interest. Ethics Approval Statement: Ethical approval was obtained from the University of Ibadan / University College Hospital Institutional Review Board. Permission was sought from the schools’ authority and enrolment into the study was voluntary after explanation of the intentions and purpose of the study to the students. A letter of explanation was sent home to the parents/guardians. Assent was taken from the students before administering the questionnaire. Participants could withdraw from the study without loss of benefits.
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