Table 1 Clinical features of the study population (n = 757).

Men	508 (67%)
Women	249 (33%)
Age (years)	66 (10)
<60 years	188 (25%)
>61 years	569 (75%)
Duration of arrhythmia (634 patients)	82 (132) (range 3–1000)
Unknown	123 (16.2%)
<30 days	291 (38%)
31–90 days	190 (25.1%)
>91 days	153 (20.2%)
Atrial fibrillation	639 (84.5%)
Atrial flutter	118 (15.5%)

Data are number (%) or mean (SD).