Relation between prevalence of COPD to the gender of subjects (n = 5220) Subjects Sex Total (n = 5220) COPD (n = 310)% OR (95% CI) p Male 2326 202 8.7 2.45 (1.9 - 3.1) < 0.01 Female 2894 108 3.7 Total 5220 310 5.9 Comments: proportion of COPD in male is 8.7% and female is 3.7%.