RT Journal Article SR Electronic T1 Variations in the prevalence of childhood asthma and wheeze in MeDALL cohorts in Europe JF ERJ Open Research JO erjor FD European Respiratory Society SP 00150-2016 DO 10.1183/23120541.00150-2016 VO 3 IS 3 A1 Eleonora P. Uphoff A1 Philippa K. Bird A1 Joseph Maria Antó A1 Mikel Basterrechea A1 Andrea von Berg A1 Anna Bergström A1 Jean Bousquet A1 Leda Chatzi A1 Maria Pia Fantini A1 Amparo Ferrero A1 Ulrike Gehring A1 Davide Gori A1 Joachim Heinrich A1 Thomas Keil A1 Inger Kull A1 Susanne Lau A1 Dieter Maier A1 Isabelle Momas A1 Silvia Narduzzi A1 Daniela Porta A1 Fanny Ranciere A1 Theano Roumeliotaki A1 Tamara Schikowski A1 Henriette A. Smit A1 Marie Standl A1 Jordi Sunyer A1 John Wright YR 2017 UL http://openres.ersjournals.com/content/3/3/00150-2016.abstract AB While there is evidence for variations in prevalence rates of childhood wheeze and asthma between countries, longitudinal, individual-level data are needed to understand these differences. The aim of this study was to examine variations in prevalence rates of childhood asthma, wheeze and wheeze with asthma in Europe.We analysed datasets from 10 MeDALL (Mechanisms of the Development of ALLergy) cohorts in eight countries, representing 26 663 children, to calculate prevalence rates of wheeze and asthma by child age and wheeze with asthma at age 4 years. Harmonised variables included outcomes parent-reported wheeze and parent-reported doctor-diagnosed asthma, and covariates maternal education, parental smoking, pets, parental asthma, doctor-diagnosed allergic rhinitis, doctor-diagnosed eczema and wheeze severity.At age 4 years, asthma prevalence varied from 1.72% in Germany to 13.48% in England and the prevalence of wheeze varied from 9.82% in Greece to 55.37% in Spain. Adjusted estimates of the proportion of 4-year-old children with wheeze diagnosed with asthma remained highest in England (38.14%, 95% CI 31.38–44.90%) and lowest in Spain (15.94%, 95% CI 6.16–25.71%).The large differences in prevalence rates of asthma, wheeze and wheeze with asthma at age 4 years between European cohorts may indicate that childhood asthma is more readily diagnosed in some countries while going unrecognised elsewhere.Large variations in childhood wheeze across Europe do not match large variations in diagnosed childhood asthma http://ow.ly/eJQk30aPInr