Baseline characteristics of study patients of all qualified trials in this meta-analysis.

<p><i>Abbreviations:</i> AF-d, atrial fibrillation duration; LA-d, left atrium diameter; PAF, paroxysmal atrial fibrillation; LVEF, left ventricular ejection fraction; CAD, coronary artery disease; Hypertens, hypertension; NA, not available. Digital data were expressed as counting or percentages between cryoballoon/radiofrequency techniques unless otherwise indicated.