CERT1 and chronic obstructive pulmonary disease: For CERT1, the association with prevalent COPD was significant (univariable OR = 1.81, 95% CI: 1.41-2.33, p = < 0.001), as was the association with incident COPD (univariable HR = 1.33, 95% CI: 1.16-1.53, p = < 0.001).