Open Access
Prevalence and risk factors for wheezing in infants in the region of Pamplona, Spain
(Elsevier, 2016) Álvarez Álvarez, Ismael; Niu, Hao; Aguinaga Ontoso, Inés; Guillén Grima, Francisco; Ciencias de la Salud; Osasun Zientziak; Gobierno de Navarra / Nafarroako Gobernua: 6106
Background: Wheezing in the first year of life affects life’s quality of the baby and the family. Risk factors such as male gender, nursery attending or a family history of asthma, and protective factors such as breastfeeding more than 6 months have been previously described. The aim of this study is to study the prevalence and risk factors for wheezing ever and recurrent wheezing in the first year of life in infants in the region of Pamplona, Spain. Material and methods: This cross-sectional study was part of the International Study of Wheezing in Infants (Estudio Internacional de Sibilancias en Lactantes, EISL). Between 2006 and 2008, participating families answered a standardized validated questionnaire on respiratory symptoms, environmental factors or family issues. An analysis with the chi square test (statistical significance p<0.05) identified the risk factors for wheezing ever and recurrent wheezing, which were assessed using logistic regression. Results: 1065 questionnaires were answered. The prevalence of wheezing ever and recurrent wheezing were 31.2% and 12.3%, respectively. Male gender (p=<0.001), a history of pneumonia (p=<0.001) or nursery attendance (p=<0.001) were some of the risk factors found for wheezing ever. Infant eczema (p=<0.001), nursery attendance (p=<0.001) or prematurity (p=<0.001) were risk factors for recurrent wheezing. No associations with duration of breastfeeding (p=0.116 and p=0.851) or mould stains at home (p=0.153 and p=0.992) were found. Conclusion: The study of prevalence and risk factors for wheezing shows the importance of this public health problem, and allows the development of control and treatment strategies against preventable factors.
Open Access
Meta-analysis of prevalence of wheezing and recurrent wheezing in infants
(Elsevier, 2016) Álvarez Álvarez, Ismael; Niu, Hao; Guillén Grima, Francisco; Aguinaga Ontoso, Inés; Ciencias de la Salud; Osasun Zientziak
Background: Wheezing affects children’s quality of life, and is related with asthma in childhood. Although prevalence of wheezing has been previously studied in several countries, there are no reference of worldwide prevalence in infants. The aim of this meta-analysis is to estimate the prevalence of wheezing and recurrent wheezing in infants aged up to two years, and compare the prevalence across world regions. Methods: Literature search was conducted in MEDLINE and SCOPUS databases, looking for observational studies published up to June 2016, including as keywords “prevalence” or “epidemiology” combined with “wheeze”, “wheezing” or “asthma symptoms” and “infant” or “preschool”. Fast*Pro software and random effects Bayesian model were used. Heterogeneity was estimated using I2 statistic, and sensitivity analyses were performed. Results: We identified 109 studies after duplicates were removed. After exclusions, 14 studies were included in the meta-analysis. Prevalence of wheezing and recurrent wheezing were 36.06% (95% CI 35.17-36.96), and 17.41% (95% CI 16.74-18.09), respectively. In European countries, prevalence of wheezing was 30.68% (95% CI 28.97-32.45), and 12.35% (95% CI 11.27-13.47) for recurrent wheezing. Prevalence of wheezing and recurrent wheezing in Latin America were higher, 40.55% (95% CI 39.40-41.71), and 19.27% (95% CI 18.44-20.11), respectively. In Africa, prevalence of wheezing was 15.97% (95% CI 14.05-18.00). Low or no heterogeneity was found in all cases. Conclusions: More than one third of infants suffer from wheezing and almost one fifth from recurrent wheezing, being these illnesses especially prevalent in Latin American countries, pointing out an important public health problem.
Open Access
Prevalence and incidence of Alzheimer's disease in Europe: a meta-analysis
(Elsevier España, 2017) Niu, Hao; Álvarez Álvarez, Ismael; Guillén Grima, Francisco; Aguinaga Ontoso, Inés; Ciencias de la Salud; Osasun Zientziak
Background: A disease of unknown aetiology, Alzheimer’s disease (AD) is the most common type of dementia. As the elderly population grows worldwide, the number of patients with AD also increases rapidly. The aim of this meta-analysis is to evaluate the prevalence and incidence of AD in Europe. Methodology: We conducted a literature search on Medline, Scopus, and CINAHL Complete using the keywords ‘‘Alzheimer’’, ‘‘Alzheimer’s disease’’, and ‘‘AD’’ combined with ‘‘prevalence’’, ‘‘incidence’’, and ‘‘epidemiology’’. A Bayesian random effects model with 95% credible intervals was used. The I 2 statistic was applied to assess heterogeneity. Results: The prevalence of Alzheimer’s disease in Europe was estimated at 5.05% (95% CI, 4.73-5.39). The prevalence in men was 3.31% (95% CI, 2.85-3.80) and in women, 7.13% (95% CI, 6.56-7.72), and increased with age. The incidence of Alzheimer’s disease in Europe was 11.08 per 1000 person-years (95% CI, 10.30-11.89). Broken down by sex, it was 7.02 per 1000 person-years (95% CI, 6.06-8.05) in men and 13.25 per 1000 person-years (95% CI, 12.05-14.51) in women; again these rates increased with age. Conclusions: The results of our meta-analysis allow a better grasp of the impact of this disease in Europe.

Álvarez Álvarez, Ismael

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