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Table 3 Sample characteristics in Henan Province from January 2010 to June 2010

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

  Urban Rural P-value
  Zhongyuan district in Zhengzhou (economic level – H) Longting District in Kaifeng (economic level – L) Zhongmu county (economic level – H) High-tech zone in Puyang City (economic level – L) Mengjin County (economic level – M)  
Subjects (n) 4,017 3,907 4,180 3,894 3,718  
Females 48.8% 49.5% 48.1% 48.0% 48.8% 0.686
College degree 4.3% 8.8% 0.9% 1.2% 1.2% 〈0.01
Without medical insurance 0.4% 4.5% 1.1% 0.3% 0.5% 〈0.01
Smoke or smoked in the past 16.2% 21.1% 23.1% 22.5% 21.1% 〈0.01