Prevalence and risk factors of childhood allergic diseases in eight metropolitan cities in China: a multicenter study.

BMC Public Health · 2011 · PMC3148998 · PMID 21645361

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an increasing trendno p-value reported

In 1990 and 2000, two national surveys were conducted and showed that the prevalence of asthma among children 0-14 years old was 1% and 1.97% [ 4 ], respectively, suggesting an increasing trend of asthma.

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