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Inicio Allergologia et Immunopathologia A rural environment does not protect against asthma or other allergic diseases a...
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Vol. 46. Num. 1.January - February 2018
Pages 1-104
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Vol. 46. Num. 1.January - February 2018
Pages 1-104
Original Article
DOI: 10.1016/j.aller.2017.01.010
A rural environment does not protect against asthma or other allergic diseases amongst Mexican children
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M. Bedolla-Barajasa,
Corresponding author
drmbedbar@gmail.com

Corresponding author.
, F. Javier Ramírez-Cervantesb, J. Morales-Romeroc, J. Jesús Pérez-Molinad, C. Meza-Lópezd, N. Delgado-Figueroad
a Servicio de Alergia e Inmunología Clínica, Hospital Civil de Guadalajara “Dr. Juan I. Menchaca”, Salvador de Quevedo y Zubieta No. 750, Colonia La Perla, Guadalajara, Jalisco C.P. 44340, Mexico
b Centro Universitario de los Altos, Universidad de Guadalajara, Carretera a Yahualica km. 7.5, Tepatitlán de Morelos, Jalisco C.P. 47630, Mexico
c Instituto de Salud Pública, Universidad Veracruzana, Av. Luis Castelazo Ayala s/n., Colonia Industrial Ánimas, Xalapa, Veracruz C.P. 91190, Mexico
d División de Pediatría, Hospital Civil de Guadalajara “Dr. Juan I. Menchaca”, Salvador de Quevedo y Zubieta No. 750, Colonia La Perla, Guadalajara, Jalisco C.P. 44340, Mexico
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Tables (4)
Table 1. Characteristics of the studied population.
Table 2. Prevalence of the symptoms regarding allergic diseases among school-aged children according to the region in which they live.
Table 3. Multivariate model of factors associated to the prevalence of allergic diseases.
Table 4. Multivariate model of factors associated to symptoms of asthma, allergic rhinitis, and atopic dermatitis during the previous year.
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Abstract
Introduction

The commonly held notion that a rural environment decreases the frequency of allergic diseases has proven to be inconsistent amongst children.

Objective

Our objective was to contrast the prevalence of bronchial asthma (BA), allergic rhinitis (AR), and atopic dermatitis (AD) between children that live in a rural environment and those that live in urban areas.

Methods

We carried out a cross-sectional study amongst children aged six to seven; they were selected through probabilistic, stratified and conglomerated sampling. The prevalence of BA, AR, and AD was identified with the use of the questionnaire provided by The International Study of Asthma and Allergies in Childhood, additionally, we inquired about each child's family history of atopy, their exposure to farm animals, the intake of unpasteurised cow's milk, and the number of siblings related to every child. We used logistic regression and multivariate analysis to determine the correlation between asthma, allergic diseases, and rural environment.

Results

We included 189/1003 (18.8%) children from a rural environment, and 814/1003 (81.2%) from an urban area. BA and AR were associated to a family history of atopy (OR=2.15, p=0.001; OR=2.58, p=0.002, respectively). BA was more prevalent in males (OR=1.92, p=0.007). Notably, a higher number of siblings seems to protect against AR (OR=0.45, p=0.008). A paternal history of allergies was associated to AD.

Conclusions

In our study, we were unable to find protective factors in a rural environment that might decrease the prevalence of asthma or allergic diseases.

Keywords:
Asthma
Children
Allergic diseases
Rural
Urban

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