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#