biostudies-literatureUnknown12(10)Cao S<h4>Background</h4>The prevalence of childhood asthma may have changed with rapid economic development. This study aims to ascertain potential changes in asthma prevalence in relation to changes in socioeconomic, parental and household factors, based on a comparison between two periods spanning over 20 years in Lanzhou, a large northwestern city of China.<h4>Methods</h4>Cross-sectional studies using the same protocols were performed in Lanzhou, China in 1994-1995 (Period I) and in 2017 (Period II). Children of 6-12 years old from elementary schools were selected by a multistage sampling method. Information on the presence of asthma and asthma-related symptoms of children, socioeconomic status, feeding methods, parental illness and behavior patterns, as well as household characteristics, weJournal of thoracic disease6365-6378https://www.ebi.ac.uk/biostudies/studies/S-EPMC7656413biostudies-literatureChanges in children's asthma prevalence over two decades in Lanzhou: effects of socioeconomic, parental and household factors.PMC7656413Zhang JJQin NLi SZhang YCao SGong JXu XWen DGuo QDuan XMeng XfalseChanges in children's asthma prevalence over two decades in Lanzhou: effects of socioeconomic, parental and household factors.<h4>Background</h4>The prevalence of childhood asthma may have changed with rapid economic development. This study aims to ascertain potential changes in asthma prevalence in relation to changes in socioeconomic, parental and household factors, based on a comparison between two periods spanning over 20 years in Lanzhou, a large northwestern city of China.<h4>Methods</h4>Cross-sectional studies using the same protocols were performed in Lanzhou, China in 1994-1995 (Period I) and in 2017 (Period II). Children of 6-12 years old from elementary schools were selected by a multistage sampling method. Information on the presence of asthma and asthma-related symptoms of children, socioeconomic status, feeding methods, parental illness and behavior patterns, as well as household characteristics, we2020-01-01T00:00:00Z2020 Oct2025-04-04T23:46:48.812Z2025-04-04T23:46:48.812ZS-EPMC76564133320947510.21037/jtd-19-crh-aq-008