Associations of early life exposures and environmental factors with asthma among children in rural and urban areas of Guangdong, China

M Feng, Z Yang, L Pan, X Lai, M Xian, X Huang… - Chest, 2016 - Elsevier
Background Environmental factors may play important roles in asthma, but findings have
been inconsistent. Objective The goal of this study was to determine the associations
between early life exposures, environmental factors, and asthma in urban and rural children
in southeast China. Methods A screening questionnaire survey was conducted in 7,164
children from urban Guangzhou and 6,087 from rural Conghua. In the second stage,
subsamples of 854 children (419 from Guangzhou, 435 from Conghua) were recruited for a …