Table 2. Using logistic regression, final model has been derived that is consistent with Chi Square test.

Variables	OR	95% CI	P value
Age	1.02	0.001–0.04	0.058
Male	1.81	0.26–0.93	0.001
Overlap syndrome group	3.66	1.06–6.9	0.007
COPD group	1.79	0.19–9.6	0.003
CKD	2.06	0.25–1.19	0.002
HF	1.86	0.22–1.01	0.002
Hypertension	1.94	0.30–1.04	0.001
Valvular disorders	1.55	-0.05–0.89	0.066

Predictors that are highly correlated to each other have been eliminated. For example, CAD and HF are highly correlated, and thus only HF has been included in this model. Final model shows that COPD and COPD plus OSA group is highly significant relationship with new-onset AF. COPD: chronic obstructive pulmonary disease; CKD: chronic kidney disease, HF: heart failure; OSA: obstructive sleep apnea.