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Table 4 Asthma prevalence in each sampling area in Henan Province from January 2010 to June 2010

From: Epidemiology of bronchial asthma and asthma control assessment in Henan Province, China

Sampling area No. of samples Cases of asthma Prevalence of asthma (%) P value
Urban area 7,924 88 1.11 ± 0.23 <0.01*
Zhongyuan District in Zhengzhou (economic level – H) 4,017 34 0.846 ± 0.28  
Longting District in Kaifeng (economic level – L) 3,907 54 1.382 ± 0.37 0.02**
Rural area 11,792 57 0.483 ± 0.12  
Zhongmu County (economic level – H) 4,180 33 0.789 ± 0 .27  
High-tech zone in Puyang City (county) (economic level – L) 3,894 6 0.154 ± 0.12 <0.01***
Mengjin County (economic level – M) 3,718 18 0.484 ± 0.22  
  1. *Comparison of asthma prevalence between residents in urban and rural areas. **Comparison of prevalence in different urban areas. ***Comparison of asthma prevalence among residents in different rural areas.