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Table 2 Demographics of COPD patients and control subjects

From: Association of genetic polymorphisms with chronic obstructive pulmonary disease in the Chinese Han population: a case–control study

  COPD Controls P value
Number 331 213  
Age 61±10 58±12  
Male(%) 298(90%) 209(98%)  
Female(%) 33(10%) 4(2%)  
Pack-years(±SD) 41±34 38±17  
FEV1/FVC 54±13.8* 85±7.6* p<0.05
FEV1/predicted(%) 49±18.1# 88±17.0# p<0.05
  1. Data were presented as the means ± SD. FEV1, forced expiratory volume in 1 sec; FVC, forced vital capacity; *p<0.05 significant difference vs control.
  2. #p<0.05 significant difference vs control.