Table of Contents
Epidemiology Research International
Volume 2013, Article ID 490906, 6 pages
http://dx.doi.org/10.1155/2013/490906
Research Article

Validation of the ISAAC Standardized Questionnaire Used by Schoolchildren from Mexicali, Baja California, Mexico

1Instituto Nacional de Salud Pública, Avenida Universidad No. 655, Colonia Santa María Ahuacatitlán, 62100 Cuernavaca, MOR, Mexico
2Universidad Autónoma de Chihuahua, Avenida Escorza No. 900, Zona Centro, 31000 Chihuahua, CHIH, Mexico
3Universidad Autónoma Metropolitana—Iztapalapa, Avenida San Rafael Atlixco 186, Colonia Vicentina, Delegación Iztapalapa, 09340 Mexico City, DF, Mexico

Received 11 July 2013; Revised 18 October 2013; Accepted 19 October 2013

Academic Editor: David Christiani

Copyright © 2013 Karla Gorozave-Car et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Background. In Mexico, several studies have been conducted under the ISAAC methodology; nevertheless, no validation studies of the ISAAC questionnaire based on objective clinical testing in our country have been published. Aims of the Study. To validate the ISAAC questionnaire, used in a study of prevalence of allergic diseases, based on medical, respiratory, and allergic evaluations of schoolchildren being 11 to 16 years old in Mexicali, Mexico. Material and Methods. We conducted a cross-sectional study to validate the ISAAC questionnaire through the generation of an index (considered as gold standard) using pre- and postbronchodilator spirometry test, exhaled nitric oxide measurements, and atopic evaluations. 114 schoolchildren were included (23 asthmatics with respiratory symptoms and 91 nonasthmatics without respiratory symptoms) and we evaluated the sensitivity, specificity, and positive and negative predictive value of the questionnaire using discriminant analysis. Results. We observed sensitivity of 35.2% and specificity of 93.3% and the positive and negative predictive values were 82.6% and 61.5%, respectively. Conclusions. Our findings indicate that the ISAAC Mexican version questionnaire was less sensitive and more specific when compared to the gold standard; however, it is adequate and able to discriminate children with and without asthma and a useful tool to use in epidemiological studies.