Low mMRC score (OR = 5.04, CI 95% 1.19 - 1.30), guided within 3 last months (OR = 3.87, CI 95% 1.13 - 13.22) and used to be guided by medical staff (OR = 6.3, CI 95% 1.77 - 22.53) were the factors associated with correct inhaler technique.