Exposure to pollutants is related to house typology. Besides smoking, indoor air pollution is a significant risk factor of chronic respiratory diseases (CRD). The prevalence of CRD in different house types was studied in Ho Chi Minh City. 1561 people living in four house types, were enrolled. Those house types are apartment, rental house (a very small house with ground floor, toilet and main room, with or without windows, often built into row of rental houses), rural house (a one floor and separate house which is built in rural and suburban district by wood or semisolid materials) and tube house (several floors, built close together, very small in width and deep in length). Information on respiratory health, lung function, residential characteristics, and indoor environmental sources was obtained by questionnaire and spirometry. The two main respiratory health outcomes studied are clinical CRD (CCRD) (symptom of CRD) and chronic obstructive respiratory diseases (CORD) (FEV1/FVC < 0.7). The prevalence of CCRD (24.3%) and CORD (5.3%) did not equally distribute among studied house types (p<0.0001, Chi-square). It is equal in tube house and apartment. Comparing to people living in apartment, those who live in rental house had a 46% higher risk of developing CCRD. The odds of CORD for people living in rental house and in rural house were 4.64 (1.97-10.5) folds and 2.99 (1.21-7.37) folds higher. Controlled factors were age, sex, in home time, smoking level, occupational risk, previous tuberculosis and presence of pet, rat, cockroach, flooded wall, biomass usage and air-conditioner. House type was associated with a likelihood of CCRD and CORD morbidity.
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