Children with age 13-14 years at the time of questionnaires completion, and residing in Dubai and the Northern Emirates of UAE.

Children with age 6-7 years at the time of questionnaires completion, and residing in Dubai and the Northern Emirates of UAE.

Completion of the International study of Asthma and Allergies in Children(ISAAC)core questionnaires:

1. Core questionnaire on wheezing.
2. Core questionnaire on rhinitis.
3. Core questionnaire on atopic dermatitis.

Through International study of Asthma and Allergies in Children(ISAAC)core questionnaire on Asthma and Wheezing: A set of 8 questions to address wheezing attacks, assessing the prevalence of wheezing illness, frequency of wheezing, diagnosis of asthma.Descriptive summaries of the data will be presented. Comparisons between different centers on the rates of events will be made using appropriate methods. Crude rates can be compared by using contingency tables or logistic regression. Comparison of standardized rates or data that needs controlling for confounding will require analysis by logistic regression

Through International study of Asthma and Allergies in Children(ISAAC)core questionnaire on (a)Wheezing,(b)rhinitis and (c)atopic dermatitis.

1. Wheezing questionnaire:8 questions to address wheezing attacks, frequency, assessing prevalence illness, diagnosis of asthma.

2. Rhinitis questionnaire : 6 questions to addressing detection of rhinitis, detecting atopy among subjects with rhinitis , interference with daily activities.

3. Atopic Dermatitis questionnaire : 7 questions to addressing severity, rashes, and nonatopic forms of eczema.

   • Most of the questions used iare Binary questions Yes or NO .
   • Data from 6-7 year old and 13-14 year old analysis separately. Each measure of prevalence and severity will be compared between centres. The effect of cluster sampling by schools will considered in the analysis.
   • Basic descriptive summaries data will be compiled and presented for each condition, in both age groups, for males and females, from each centres.

Questionnaire of Exposer to Arabian incense "Bokhor"