Table 3: Multivariate analysis to determine factors associated with persistent atrial fibrillation.

FactorAdjusted odd ratios95% CI value

Current/past smoker4.91.8, 140.002
Lower free T4 at diagnosis2.11.2, 3.50.008
Larger LA diameter2.61.2, 5.50.014
Having a past episode of thyrotoxicosis1.80.29, 2.10.642
LVDD1.10.49, 2.20.925

Note. LVDD: left ventricular end diastolic diameter; LA: left atrium; .