Publication: Prevalence of bronchial hyperresponsiveness and asthma in the adult population in Thailand
Issued Date
2006-01-01
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ISSN
00123692
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2-s2.0-33645117650
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Mahidol University
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SCOPUS
Bibliographic Citation
Chest. Vol.129, No.3 (2006), 602-609
Suggested Citation
Wanchai Dejsomritrutai, Arth Nona, Nitipatana Chierakul, Jamsak Tscheikuna, Suree Sompradeekul, Pimon Ruttanaumpawan, Suchai Charoenratanakul Prevalence of bronchial hyperresponsiveness and asthma in the adult population in Thailand. Chest. Vol.129, No.3 (2006), 602-609. doi:10.1378/chest.129.3.602 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/23848
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Title
Prevalence of bronchial hyperresponsiveness and asthma in the adult population in Thailand
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Abstract
Objectives: We conducted a nationwide cross-sectional survey of respiratory health in adults aged 20 to 44 years during 2001 to 2002 to determine the prevalence of bronchial hyperresponsiveness (BHR) and asthma in the adult Thai population. Design: Subjects were selected by a multistage stratified random sampling. The stratification was done on geographic area, age group, and sex. Subjects were interviewed with questionnaires and underwent spirometric testing. Methacholine challenge tests were performed on all subjects without contraindication to determine BHR defined as the provocative concentration of methacholine producing a 20% fall in FEV1≤ 8 mg/mL. Definite asthma was defined as BHR present with any asthma symptom within the past 12 months or demonstrated reversible airflow obstruction. Current diagnosed asthma was defined as previous physician-diagnosed asthma and any asthma symptom within the past 12 months or currently receiving asthma medication. Results: The study population was from 20 provinces of five geographic regions of Thailand and included 1,882 women and 1,572 men. The prevalence of BHR was 3.31% (95% confidence interval [CI], 2.68 to 3.94). However, if subjects with positive reversibility test results were included, the prevalence increased to 3.98% (95% CI, 3.30 to 4.67). The prevalence of definite asthma was 2.91% (95% CI, 2.32 to 3.50), whereas the prevalence of current diagnosed asthma by the questionnaire interview was 2.15% (95% CI, 1.66 to 2.63). The κ index of the agreement between both definitions of asthma was 0.40, indicating poor to fair agreement. Conclusion: The prevalence of BHR and asthma in the adult Thai population is relatively low as compared with western countries.